SSAT Elementary Level Math : How to find the perimeter of a rectangle

Study concepts, example questions & explanations for SSAT Elementary Level Math

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Example Questions

Example Question #431 : Plane Geometry

If Adam draws a rectangle with a long side of 6 cm and a short side of 5 cm, what is the perimeter? 

Possible Answers:

\displaystyle 22\ cm

\displaystyle 11\ cm

\displaystyle 30\ cm

\displaystyle 20\ cm

Correct answer:

\displaystyle 22\ cm

Explanation:

To find the perimeter of a rectangle, add all four sides:

\displaystyle 6\ cm+6\ cm+5\ cm+5\ cm=22\ cm

Example Question #432 : Plane Geometry

One rectangular lane in a swimming pool is \displaystyle 8 feet wide and \displaystyle 100 feet long. What is the area of the lane?

Possible Answers:

\displaystyle 100 square feet

\displaystyle 800 square feet

\displaystyle 108 square feet

\displaystyle 180 square feet

\displaystyle 80 square feet

Correct answer:

\displaystyle 800 square feet

Explanation:

Area is calculated for a rectangle as width multiplied by length. In this case, \displaystyle 8 \times 100 = 800 square feet.

Example Question #433 : Plane Geometry

Which of the lists below could represent the side lengths of a rectangle?

Possible Answers:

\displaystyle 2,2,5,5

\displaystyle 1,4,6,6

\displaystyle 3,3,3,7

\displaystyle 1,3,5,7

Correct answer:

\displaystyle 2,2,5,5

Explanation:

Rectangles have two pairs of equal sides. 

Example Question #441 : Plane Geometry

Bdaycake

A rectangular birthday cake (shown above) measures 8 inches by 12 inches. What is the perimeter of the cake?

Possible Answers:

\displaystyle 40\ in

\displaystyle 20\ in

\displaystyle 96\ in

\displaystyle 32\ in

Correct answer:

\displaystyle 40\ in

Explanation:

\displaystyle Perimeter\; of\;a\;rectangle=length+length+width+width= 2l +2w

\displaystyle Perimeter= 12+12+8+8= 2(12) +2(8)=24+16=40

Example Question #1 : How To Find The Perimeter Of A Rectangle

Screen_shot_2014-01-02_at_10.15.24_pm

What is the perimeter of the above rectangle?

Possible Answers:

\displaystyle 36

\displaystyle 30

\displaystyle 33

\displaystyle 3

\displaystyle 12

Correct answer:

\displaystyle 30

Explanation:

To find the perimeter of this rectangle, add all four sides together. Even though we are not given the length of all four sides, we know that opposite sides are always equal. 

\displaystyle 12 + 3 + 12 + 3 = 30

Example Question #2 : How To Find The Perimeter Of A Rectangle

A rectangular table can seat \displaystyle 4 people on each of its longer sides and \displaystyle 2 people on each of its shorter sides.

How many people are at the table when all the seats are filled?

Possible Answers:

\displaystyle 16 people

\displaystyle 8 people

\displaystyle 12 people

\displaystyle 10 people

\displaystyle 6 people

Correct answer:

\displaystyle 12 people

Explanation:

Since a rectangle has two pairs of equal-length sides, multiply the number of people that can sit on each side by \displaystyle 2, then add these numbers together to find the total number of people that can sit at the table.

\displaystyle (2\times4) + (2\times 2) = 8 + 4 = 12 people

Example Question #3 : How To Find The Perimeter Of A Rectangle

If Elijah draws a rectangle with a long side of 9 cm and a short side of 3 cm, what is the perimeter of the rectangle? 

Possible Answers:

32 cm

28 cm

27 cm

24 cm

Correct answer:

24 cm

Explanation:

To find the perimeter of a rectangle, add all four sides:

\displaystyle 9\: cm+9\: cm+3\: cm+3\: cm=24\: cm

Example Question #1 : How To Find The Perimeter Of A Rectangle

Screen_shot_2014-02-12_at_9.31.18_pm

What is the perimeter of the above rectangle?

Possible Answers:

\displaystyle 35

\displaystyle 12

\displaystyle 46

\displaystyle 75

\displaystyle 24

Correct answer:

\displaystyle 24

Explanation:

To find the perimeter of this rectangle, add all four sides together. Even though we are not given the length of all four sides, we know that opposite sides of a rectangle are always equal!

\displaystyle 7 + 5 + 7 + 5 = 24

Example Question #443 : Plane Geometry

What is the PERIMETER of the rectangle in the image?

Possible Answers:

90 cm

40 cm

40 cm

80 cm

300 cm

Correct answer:

80 cm

Explanation:

Because the problem asks you to find the perimeter, you are looking for the total distance around the outside of the shape. The problem also tells you that the figure is a rectangle, so you know that all the sides are 10 cm and 30 cm. Adding all four sides gives the perimeter: \displaystyle 10 \: cm + 10 \: cm + 30 \: cm + 30 \: cm = 80\: cm

Example Question #444 : Plane Geometry

Screen_shot_2014-03-04_at_9.28.42_pm

What is the perimeter of the rectangle?

Possible Answers:

\displaystyle 19

\displaystyle 32

\displaystyle 27

\displaystyle 97

\displaystyle 24

Correct answer:

\displaystyle 24

Explanation:

To find the perimeter of a rectangle, add all four sides together.

\displaystyle 9 + 9 + 3 + 3 = 24

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