Intermediate Geometry : Trapezoids

Study concepts, example questions & explanations for Intermediate Geometry

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Example Questions

Example Question #41 : Trapezoids

Find the value of  if the area of the trapezoid below is .

3

Possible Answers:

Correct answer:

Explanation:

The formula to find the area of a trapezoid is

.

Substitute in the values for the area, a base, and the height. Then solve for .

 

Example Question #301 : Plane Geometry

Find the value of  if the area of the trapezoid below is .

12

Possible Answers:

Correct answer:

Explanation:

The formula to find the area of a trapezoid is

.

Substitute in the values for the area, a base, and the height. Then solve for .

 

Example Question #303 : Intermediate Geometry

The area of the trapezoid below is . Find the length of .

4

Possible Answers:

Cannot be determined from the information given.

Correct answer:

Explanation:

Start by drawing in the height, , to form a right triangle.

4a

Use the Pythagorean Theorem to find the length of .

Now that we have the height, plug in the given information into the formula to find the area of the trapezoid.

Keep in mind that .

The question asks you to find the length of .

 

 

Example Question #41 : Trapezoids

Find the length of . The area of the trapezoid is . Round to the nearest hundredths place.

6

Possible Answers:

Cannot be determined from the information given.

Correct answer:

Explanation:

First, draw in the height .

6a

First, find  by using .

Now, plug in the values for area, height, and one base to find the length of the second base, .

Example Question #43 : Trapezoids

The area of the trapezoid below is . Find the length of . Round to the nearest hundredths place.

10

Possible Answers:

Correct answer:

Explanation:

First, draw in the height.

10a

First, find the height by using .

Now, plug in the values for area, height, and one base to find the length of the second base, .

Example Question #304 : Intermediate Geometry

The area of the trapezoid below is . Find the length of . Round to the nearest hundredths place.

11

Possible Answers:

Correct answer:

Explanation:

First, draw in the height.

11a

First, find the height by using .

Now, plug in the values for area, height, and one base to find the length of the second base, .

Example Question #131 : Quadrilaterals

Given: Quadrilateral  such that  and 

True, false, or undetermined: Quadrilateral  is a trapezoid.

Possible Answers:

True

Undetermined

False

Correct answer:

True

Explanation:

Quadrilateral  has at least one pair of parallel sides,  and . The figure is, by definition, a parallelogram if and only if , and, by definition, a trapezoid if and only if . Opposite sides of a parallelogram are also congruent; since , Quadrilateral  is not a parallelogram. It is therefore a trapezoid.

Example Question #45 : Trapezoids

A trapezoid has height 20 inches and area 640 square inches. Which of these choices can represent the lenghts of the two bases of the trapezoid?

Possible Answers:

32 inches and 32 inches

2 inches and 60 inches

18 inches and 44 inches

25 inches and 35 inches

27 inches and 37 inches

Correct answer:

27 inches and 37 inches

Explanation:

We can apply the area formula here.

The sum of the bases must be 64 inches. We check each one of these choices, except for 32 inches and 32 inches, which can be eliminated as the bases cannot be of the same length.

Only 27 and 37 have 64 as a sum, so this is the correct choice.

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