Common Core: 3rd Grade Math : Geometric Measurement: Recognizing Perimeter

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

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Example Questions

Example Question #372 : Quadrilaterals

Charlie just moved into a new house with a fenced in yard. The fence is \displaystyle 10 meters long and \displaystyle 7 meters wide. What is the perimeter of his yard? 

Possible Answers:

\displaystyle 34m

\displaystyle 33m

\displaystyle 36m

\displaystyle 35m

\displaystyle 32m

Correct answer:

\displaystyle 34m

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(10+7)

\displaystyle P=2(17)

\displaystyle P=34

Example Question #381 : Quadrilaterals

There is a park in Hannah's new neighborhood that is \displaystyle 12 meters long and \displaystyle 11 meters wide. What is the perimeter of the park? 

Possible Answers:

\displaystyle 46m

\displaystyle 47m

\displaystyle 44m

\displaystyle 43m

\displaystyle 45m

Correct answer:

\displaystyle 46m

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(12+11)

\displaystyle P=2(23)

\displaystyle P=46

Example Question #382 : Quadrilaterals

Tim is going to retile his bathroom floor. His bathroom is \displaystyle 4 meters long and \displaystyle 3 meters wide. What is the peritmeter of his bathroom? 

Possible Answers:

\displaystyle 11m

\displaystyle 14m

\displaystyle 12m

\displaystyle 10m

\displaystyle 13m

Correct answer:

\displaystyle 14m

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(4+3)

\displaystyle P=2(7)

\displaystyle P=14

Example Question #1831 : Common Core Math: Grade 3

Emily is digging a garden in her backyard that is \displaystyle 7 meters long and \displaystyle 4 meters wide. What is the perimeter of her garden? 

Possible Answers:

\displaystyle 22m

\displaystyle 23m

\displaystyle 25m

\displaystyle 26m

\displaystyle 24m

Correct answer:

\displaystyle 22m

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the perimeter we can plug our known values into the equation. 

\displaystyle P=2(7+4)

\displaystyle P=2(11)

\displaystyle P=22

Example Question #612 : Geometry

What is the width of the rectangle if the perimeter is \displaystyle 36in and the length is \displaystyle 8in?

Possible Answers:

\displaystyle 9in

\displaystyle 8in

\displaystyle 10in

\displaystyle 7in

\displaystyle 6in

Correct answer:

\displaystyle 10in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 36=2(8+w)

\displaystyle 36=16+2w

Subtract \displaystyle 16 from both sides

\displaystyle 20=2w

Divide \displaystyle 2 by both sides

\displaystyle 10=w

Example Question #21 : Find Perimeter Or Missing Side Lengths Of Polygons: Ccss.Math.Content.3.Md.D.8

What is the width of the rectangle if the perimeter is \displaystyle 36in and the length is \displaystyle 9in?

 

Possible Answers:

\displaystyle 5in

\displaystyle 6in

\displaystyle 3in

\displaystyle 4in

\displaystyle 2in

Correct answer:

\displaystyle 4in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 26=2(9+w)

\displaystyle 26=18+2w

Subtract \displaystyle 18 from both sides

\displaystyle 8=2w

Divide \displaystyle 2 by both sides

\displaystyle 4=w

Example Question #26 : Geometric Measurement: Recognizing Perimeter

What is the width of the rectangle if the perimeter is \displaystyle 36in and the length is \displaystyle 9in?

 

Possible Answers:

\displaystyle 2in

\displaystyle 4in

\displaystyle 3in

\displaystyle 5in

\displaystyle 6in

Correct answer:

\displaystyle 4in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 26=2(9+w)

\displaystyle 26=18+2w

Subtract \displaystyle 18 from both sides

\displaystyle 8=2w

Divide \displaystyle 2 by both sides

\displaystyle 4=w

Example Question #27 : Geometric Measurement: Recognizing Perimeter

What is the width of the rectangle if the perimeter is \displaystyle 26in and the length is \displaystyle 7in?

 

Possible Answers:

\displaystyle 8in

\displaystyle 9in

\displaystyle 7in

\displaystyle 5in

\displaystyle 6in

Correct answer:

\displaystyle 6in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 26=2(7+w)

\displaystyle 26=14+2w

Subtract \displaystyle 14 from both sides

\displaystyle 12=2w

Divide \displaystyle 2 by both sides

\displaystyle 6=w

Example Question #471 : Measurement & Data

What is the width of the rectangle if the perimeter is \displaystyle 18in and the length is \displaystyle 5in?

Possible Answers:

\displaystyle 8in

\displaystyle 6in

\displaystyle 4in

\displaystyle 7in

\displaystyle 5in

Correct answer:

\displaystyle 4in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 18=2(5+w)

\displaystyle 18=10+2w

Subtract \displaystyle 10 from both sides

\displaystyle 8=2w

Divide \displaystyle 2 by both sides

\displaystyle 4=w

Example Question #29 : Geometric Measurement: Recognizing Perimeter

What is the width of the rectangle if the perimeter is \displaystyle 26in and the length is \displaystyle 3in?

Possible Answers:

\displaystyle 8in

\displaystyle 10in

\displaystyle 9in

\displaystyle 11in

\displaystyle 12in

Correct answer:

\displaystyle 10in

Explanation:

The formula for perimeter of a rectangle is \displaystyle P=2(l + w)

To solve for the width we can plug our known values into the equation. 

\displaystyle 26=2(3+w)

\displaystyle 26=6+2w

Subtract \displaystyle 6 from both sides

\displaystyle 20=2w

Divide \displaystyle 2 by both sides

\displaystyle 10=w

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