Common Core: 3rd Grade Math : Find Perimeter or Missing Side Lengths of Polygons: CCSS.Math.Content.3.MD.D.8

Study concepts, example questions & explanations for Common Core: 3rd Grade Math

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Example Questions

Example Question #1021 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the polygon below? 

I

 

Possible Answers:

\(\displaystyle 61in\)

\(\displaystyle 64in\)

\(\displaystyle 62in\)

\(\displaystyle 65in\)

\(\displaystyle 63in\)

Correct answer:

\(\displaystyle 64in\)

Explanation:

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

\(\displaystyle 17+10+9+5+8+15=64\)

Example Question #1022 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the polygon below? 

J

 

Possible Answers:

\(\displaystyle 51in\)

\(\displaystyle 48in\)

\(\displaystyle 50in\)

\(\displaystyle 47in\)

\(\displaystyle 49in\)

Correct answer:

\(\displaystyle 48in\)

Explanation:

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

\(\displaystyle 14+10+5+5+9+5=48\)

Example Question #1023 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the polygon below? 

L

 

Possible Answers:

\(\displaystyle 37in\)

\(\displaystyle 36in\)

\(\displaystyle 35in\)

\(\displaystyle 34in\)

\(\displaystyle 38in\)

Correct answer:

\(\displaystyle 38in\)

Explanation:

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

\(\displaystyle 13+3+7+3+6+6=38\)

Example Question #1024 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

What is the perimeter of the polygon below? 

K

 

Possible Answers:

\(\displaystyle 42in\)

\(\displaystyle 41in\)

\(\displaystyle 39in\)

\(\displaystyle 38in\)

\(\displaystyle 40in\)

Correct answer:

\(\displaystyle 38in\)

Explanation:

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

\(\displaystyle 12+7+5+3+7+4=38\)

Example Question #645 : Geometry

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.17.56 am

 

Possible Answers:

\(\displaystyle 40cm\)

\(\displaystyle 36cm\)

\(\displaystyle 46cm\)

\(\displaystyle 42cm\)

\(\displaystyle 38cm\)

Correct answer:

\(\displaystyle 36cm\)

Explanation:

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

\(\displaystyle 16+16+4=36\)

Example Question #646 : Geometry

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.18.26 am

 

Possible Answers:

\(\displaystyle 45cm\)

\(\displaystyle 25cm\)

\(\displaystyle 30cm\)

\(\displaystyle 35cm\)

\(\displaystyle 40cm\)

Correct answer:

\(\displaystyle 45cm\)

Explanation:

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

\(\displaystyle 20+20+5=45\)

Example Question #41 : How To Find The Perimeter Of A Figure

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.22.47 am

 

Possible Answers:

\(\displaystyle 27cm\)

\(\displaystyle 36cm\)

\(\displaystyle 43cm\)

\(\displaystyle 39cm\)

\(\displaystyle 34cm\)

Correct answer:

\(\displaystyle 39cm\)

Explanation:

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

\(\displaystyle 17+17+5=39\)

Example Question #1 : Triangles

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.23.04 am

 

Possible Answers:

\(\displaystyle 29cm\)

\(\displaystyle 37cm\)

\(\displaystyle 31cm\)

\(\displaystyle 34cm\)

\(\displaystyle 41cm\)

Correct answer:

\(\displaystyle 31cm\)

Explanation:

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

\(\displaystyle 13+13+5=31\)

Example Question #91 : Geometry

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.23.29 am

 

Possible Answers:

\(\displaystyle 45cm\)

\(\displaystyle 28cm\)

\(\displaystyle 32cm\)

\(\displaystyle 34cm\)

\(\displaystyle 41cm\)

Correct answer:

\(\displaystyle 34cm\)

Explanation:

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

\(\displaystyle 14+14+6=34\)

Example Question #92 : Geometry

What is the perimeter of the triangle below? 

Screen shot 2015 11 09 at 8.23.40 am

 

Possible Answers:

\(\displaystyle 51cm\)

\(\displaystyle 53cm\)

\(\displaystyle 56cm\)

\(\displaystyle 48cm\)

\(\displaystyle 49cm\)

Correct answer:

\(\displaystyle 48cm\)

Explanation:

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

\(\displaystyle 21+21+6=48\)

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