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Basic Geometry : How to find the area of a rectangle

Study concepts, example questions & explanations for Basic Geometry

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Example Questions

Example Question #11 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

2600

1300

980

650

Correct answer:

1300

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=65 \times 20= 1300$

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Example Question #12 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

3600

5600

1800

130

Correct answer:

3600

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=90 \times 40= 3600$

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Example Question #13 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

216

108

Correct answer:

108

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=18 \times 6= 108$

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Example Question #154 : Rectangles

What is the area of a rectangle that has a length of $\frac{4}{5}$ and a width of $\frac{1}{2}$ ?

Possible Answers:

$\frac{1}{5}$

$\frac{2}{5}$

$\frac{13}{10}$

$\frac{7}{5}$

Correct answer:

$\frac{2}{5}$

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

When multiplying fractions, multiply the numerators together and multiply the denominators together. After multiplication is done, find common factors in the numerator and denominator to cancel out and completely simplify the fraction.

$\\ \text{Area}=\frac{4}{5} \times \frac{1}{2}\\ \\ \text{Area}=\frac{4}{10}=\frac{2\cdot 2}{2\cdot 5}\\ \\\text{Area}= \frac{2}{5}$

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Example Question #161 : Rectangles

What is the area of a rectangle that has a length of 1.8 and a width of 2.5 ?

Possible Answers:

3.6

4.5

5.8

7.1

Correct answer:

4.5

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

When multiplying decimals together first move the decimal over so that the number is a whole integer.

$1.8\rightarrow 18, 2.5\rightarrow 25$

Now we multiple the integers together.

$1.8\cdot 2.5\rightarrow 18\cdot 25=450$

From here, we need to move the decimal place back. In this particular problem we moved the decimal over one time for each number for a total of two decimal places.

Therefore our answer becomes,

$450\rightarrow 4.50$

$\text{Area}=1.8 \times 2.5= 4.5$

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Example Question #14 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of 12.5 and a width of ?

Possible Answers:

95.5

125

22.5

Correct answer:

125

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

When multiplying decimals together first move the decimal over so that the number is a whole integer.

$12.5\rightarrow 125$

Now we multiple the integers together.

$12.5\cdot 10\rightarrow 125\cdot 10=1250$

From here, we need to move the decimal place back. In this particular problem we moved the decimal over one place.

Therefore our answer becomes,

$1250\rightarrow 125.0$

$\text{Area}=12.5 \times 10= 125$

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Example Question #14 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of and a width of 0.75 ?

Possible Answers:

55.25

63.75

76.75

69.75

Correct answer:

63.75

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

When multiplying decimals together first move the decimal over so that the number is a whole integer.

$0.75\rightarrow 75$

Now we multiple the integers together.

$0.75\cdot 85\rightarrow 75\cdot 85=6375$

From here, we need to move the decimal place back. In this particular problem we moved the decimal over a total of two decimal places.

Therefore our answer becomes,

$6375\rightarrow 63.75$

$\text{Area}=85 \times 0.75= 63.75$

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Example Question #162 : Rectangles

What is the area of a rectangle that has a length of and a width of $\frac{1}{7}$ ?

Possible Answers:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\textup{Area}=\frac{63}{1}\times \frac{1}{7}$

$\text{Area}= \frac{1 \times 63 }{7\times 1}= \frac{63}{7}=\frac{7\cdot 9}{7}=9$

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Example Question #163 : Rectangles

If the perimeter of a rectangle is , and the length of the rectangle is , what is the area of the rectangle?

Possible Answers:

Correct answer:

Explanation:

First, use the information given about the perimeter to find the width of the rectangle.

Recall how to find the perimeter of a rectangle:

$\text{Perimeter}=2(\text{length}+\text{width})$

From this equation, we can solve for the width.

$\text{length}+\text{width}=\frac{\text{Perimeter}}{2}$

$\text{width}=\frac{\text{Perimeter}}{2}-\text{length}$

Substitute in the information from the question to find the width of the rectangle.

$\text{Width}=\frac{24}{2}-5=7$

Simplify.

$\text{Width}=7$

Now, recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Substitute in the information about the length and width to find the area for the rectangle in question.

$\text{Area}=5 \times 7$

Solve.

$\text{Area}=35$

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Example Question #164 : Rectangles

If the perimeter of a rectangle is , and the length of the rectangle is , what is the area of the rectangle?

Possible Answers:

Correct answer:

Explanation:

First, use the information given about the perimeter to find the width of the rectangle.

Recall how to find the perimeter of a rectangle:

$\text{Perimeter}=2(\text{length}+\text{width})$

From this equation, we can solve for the width.

$\text{length}+\text{width}=\frac{\text{Perimeter}}{2}$

$\text{width}=\frac{\text{Perimeter}}{2}-\text{length}$

Substitute in the information from the question to find the width of the rectangle.

$\text{Width}=\frac{18}{2}-6$

Simplify.

$\text{Width}=3$

Now, recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Substitute in the information about the length and width to find the area for the rectangle in question.

$\text{Area}=6 \times 3$

Solve.

$\text{Area}=18$

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Basic Geometry : How to find the area of a rectangle

Study concepts, example questions & explanations for Basic Geometry

All Basic Geometry Resources

Example Questions

Example Question #11 : How To Find The Area Of A Rectangle

Example Question #12 : How To Find The Area Of A Rectangle

Example Question #13 : How To Find The Area Of A Rectangle

Example Question #154 : Rectangles

Example Question #161 : Rectangles

Example Question #14 : How To Find The Area Of A Rectangle

Example Question #14 : How To Find The Area Of A Rectangle

Example Question #162 : Rectangles

Example Question #163 : Rectangles

Example Question #164 : Rectangles

All Basic Geometry Resources

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