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Grade 5 - Mathematics
7.19 Circle Problems
The radius of a circle is half the diameter.
The area of a circle is given by pi x r
2
. square units.( r is the radius and pi = 3.14)
The perimeter of a circle is the circumference.
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 r
2
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?
9.32 square feet
18.84 square feet
188 square feet
28.26 square feet
Q 2
: A circle has an area of 31,400 square inches. What is the radius?
1000 inches
6.28 inches
100 inches
10 inches
Question 3: This question is available to subscribers only!
Question 4: This question is available to subscribers only!
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