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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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

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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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

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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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

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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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.

Example Question #15 : 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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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.

Now we multiple the integers together.

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,

Example Question #16 : 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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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.

Now we multiple the integers together.

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,

Example Question #17 : 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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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.

Now we multiple the integers together.

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,

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:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

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. In this particular case the integer can be written as a fraction by putting it over one.

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

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:

From this equation, we can solve for the width.

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

Simplify.

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

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

Solve.

Example Question #20 : How To Find The Area Of A Rectangle

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:

From this equation, we can solve for the width.

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

Simplify.

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

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

Solve.

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