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### Grade 5 - Mathematics7.19 Circle Problems

 The radius of a circle is half the diameter. The area of a circle is given by pi x r2. 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 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: If the circumference of a circle is 62.8 centimeters, what is the area?3140 square centimeters313.72 square centimeters350.7 square centimeters197.192 square centimeters Q 2: A circle has an area of 31,400 square inches. What is the radius?6.28 inches10 inches1000 inches100 inches Q 3: If the diameter of the circle is 25 cm, what is its radius?12.5 cm1.25 cm18125 cm Q 4: If the radius of the circle is 10 cm, what is its diameter?5 cm20 cm20 m Q 5: The circumference of a circle is 47.1 inches. What is the area of the circle?706.5 square inches147.894 square inches70.7 square inches176.625 square inches Q 6: A circle has a radius of 3 feet. What is the area of the circle?28.26 square feet188 square feet9.32 square feet18.84 square feet Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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