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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.
Q 1: A circle has a radius of 3 feet. What is the area of the circle?
28.26 square feet
18.84 square feet
9.32 square feet
188 square feet

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

Q 3: A circle has an area of 31,400 square inches. What is the radius?
10 inches
100 inches
1000 inches
6.28 inches

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

Q 5: The circumference of a circle is 47.1 inches. What is the area of the circle?
70.7 square inches
706.5 square inches
176.625 square inches
147.894 square inches

Q 6: If the radius of the circle is 10 cm, what is its diameter?
5 cm
20 cm
20 m

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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