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Geometry and Measurement Conversions Practice Problems

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Updated on Aug 24, 2011

To review these concepts, go to Geometry and Measurement Conversions Study Guide.

Practice

Directions: Use scratch paper to solve the following problems.

1. Find the perimeter of the following polygon.
2. Find the perimeter of the following polygon.
3. Find the perimeter of a triangle with sides 3 mm, 4 mm, and 5 mm.

Find the circumference of the following.

1. a circle with radius 5 cm
2. a circle with diameter 10 m

Solutions

1. You could have added all the sides: 21 + 21 + 21 + 21 = 84. Or, you could have multiplied 21 × 4, because this polygon is a square.
2. You could have added all the sides: 35 + 7 + 35 + 7 = 84. Or, you could have used the formula P = 2l + 2w, because this polygon is a rectangle.
3. Add up the lengths of the three sides: 3 + 4 + 5 = 12. So, your final answer is 12 mm.
4. You are given the radius, so use C = 2πr. Plug in the radius and pi and multiply: (2)(3.14)(5) = 31.4. So, your final answer is 31.4 cm.
5. You are given the diameter, so use Cd. Plug in the diameter and pi and multiply: (3.14)(10) = 31.4. So, your final answer is 31.4 cm.

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