ISEE Lower Level Quantitative : Plane Geometry

Study concepts, example questions & explanations for ISEE Lower Level Quantitative

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Example Questions

Example Question #11 : Quadrilaterals

Angela found the perimeter of the trapezoid below to be 35 cm.

Screenshot_2015-03-29_at_3.18.05_pm

What is the length of the missing side?

Possible Answers:

\displaystyle 4\:cm

\displaystyle 9\:cm

\displaystyle 6\:cm

\displaystyle 12\:cm

\displaystyle 10\:cm

Correct answer:

\displaystyle 9\:cm

Explanation:

To find the perimeter of a trapezoid, add up the lengths of the four sides. In the given trapezoid,

\displaystyle x+8\:cm+12\:cm+6\:cm=35\:cm

To find the missing side, combine like terms and solve for \displaystyle x

\displaystyle x+26\:cm=35\:cm

\displaystyle x+26\:cm-26\:cm=35\:cm-26\:cm

\displaystyle x=35\:cm-26\:cm=9\:cm

The length of the missing side is thus \displaystyle 9\:cm.

Example Question #241 : Geometry

Screenshot_2015-03-29_at_3.18.30_pm

What is the perimeter of the above trapezoid?

Possible Answers:

\displaystyle 35\:cm

\displaystyle 38\:cm

\displaystyle 28\:cm

\displaystyle 30\:cm

\displaystyle 33\:cm

Correct answer:

\displaystyle 33\:cm

Explanation:

To find the perimeter of a trapezoid, add up the lengths of the four sides. In the given trapezoid,

\displaystyle 9\:cm+7\:cm+8\:cm+12\:cm=33\:cm

Example Question #1 : Parallelograms

Ted drew the parallelogram shown below.

Screenshot_2015-03-26_at_3.21.53_pm

What is the perimeter of the parallelogram?

Possible Answers:

13 feet

17 feet

12 feet

40 feet

26 feet

Correct answer:

26 feet

Explanation:

The perimeter of a parallelogram can be found by summing the lengths of each of the sides.  In a parallelogram, opposite sides have the same length.  Therefore, you should use the equation 8 + 8 + 5 + 5 = P.  The perimeter of the parallelogram is 26 feet.

Example Question #2 : Parallelograms

Guillermo drew the parallelogram below.

Screenshot_2015-03-26_at_3.32.40_pm

What is the perimeter of the parallelogram?

Possible Answers:

40 millimeters

72 millimeters

26 millimeters

20 millimeters

42 millimeters

Correct answer:

40 millimeters

Explanation:

The perimeter of a parallelogram can be found by summing the lengths of each of the sides.  In a parallelogram, opposite sides have the same length.  Therefore, you should use the equation 8 + 8 + 12 + 12 = P.  The perimeter of the parallelogram is 40 feet.

 

 

Example Question #11 : Plane Geometry

Find the perimeter of the following parallelogram.

4

Possible Answers:

\displaystyle 24

\displaystyle 15

\displaystyle 8

\displaystyle 12

Correct answer:

\displaystyle 24

Explanation:

We plug in our values into the equation for the perimeter:

\displaystyle P=2(7)+2(5)=24

Example Question #246 : Geometry

Find the perimeter of the following parallelogram. 

3

Possible Answers:

\displaystyle 15

\displaystyle 19

\displaystyle 25

\displaystyle 38

Correct answer:

\displaystyle 38

Explanation:

We plug in our values into the equation for the perimeter:

\displaystyle P=2(10)+2(9)=38

Example Question #3 : Parallelograms

Find the perimeter of the following parallelogram. 

3

Possible Answers:

\displaystyle 25

\displaystyle 28

\displaystyle 32

\displaystyle 30

\displaystyle 38

Correct answer:

\displaystyle 38

Explanation:

We plug in our values into the equation for the perimeter:

\displaystyle P=2(10)+2(9)=38

Example Question #12 : How To Find The Perimeter Of A Figure

What is the perimeter of the polygon below? 

A

 

Possible Answers:

\displaystyle 45in

\displaystyle 46in

\displaystyle 48in

\displaystyle 47in

\displaystyle 43in

Correct answer:

\displaystyle 48in

Explanation:

To find the area of a perimeter, we add all of the side lengths together. 

\displaystyle 9+15+6+8+3+7=48

Example Question #1 : Parallelograms

What is the perimeter of the polygon below? 

B

 

Possible Answers:

\displaystyle 32in

\displaystyle 31in

\displaystyle 30in

\displaystyle 33in

\displaystyle 38in

Correct answer:

\displaystyle 32in

Explanation:

To find the area of a perimeter, we add all of the side lengths together. 

\displaystyle 8+7+4+1+4+8=32

Example Question #13 : How To Find The Perimeter Of A Figure

What is the perimeter of the polygon below? 

C

 

Possible Answers:

\displaystyle 42in

\displaystyle 43in

\displaystyle 41in

\displaystyle 44in

\displaystyle 40in

Correct answer:

\displaystyle 42in

Explanation:

To find the area of a perimeter, we add all of the side lengths together. 

\displaystyle 12+5+8+4+4+9=42

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