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Grade 5 - Mathematics
7.19 Circle Problems

  1. The radius of a circle is half the diameter.
  2. The area of a circle is given by pi x r2. square units.( r is the radius and pi = 3.14)
  3. The perimeter of a circle is the circumference.
  4. The circumference of a circle is given by C = 2 x pi x r units.
Example: The radius of a circle is 5 cm. Find the area.
Area = pi x r2
Area = 3.14 x 5 x 5
Answer: 78.5 sq cm

Directions: Answer the following questions. Also write at least ten examples of your own.

Name: ___________________

Date:___________________

Grade 5 - Mathematics
7.19 Circle Problems

Q 1: A circle has an area of 31,400 square inches. What is the radius?
1000 inches
100 inches
6.28 inches
10 inches

 Q 2: If the diameter of the circle is 25 cm, what is its radius?
18
1.25 cm
12.5 cm
125 cm

Q 3: If the circumference of a circle is 62.8 centimeters, what is the area?
350.7 square centimeters
313.72 square centimeters
197.192 square centimeters
3140 square centimeters

 Q 4: A circle has a diameter of 5 inches. What is the area?
196.25 square inches
15.7 square inches
19.625 square inches
157 square inches

Q 5: If the radius of the circle is 10 cm, what is its diameter?
20 m
20 cm
5 cm

 Q 6: Find the circumference of a circle with a diameter of 13 centimeters to the nearest tenth of a centimeter.
40.8
55.1
42.9

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 Question 8: This question is available to subscribers only!


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