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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: A circle has an area of 31,400 square inches. What is the radius?100 inches6.28 inches1000 inches10 inches Q 2: Find the circumference of a circle with a diameter of 13 centimeters to the nearest tenth of a centimeter.55.140.842.9 Q 3: If the diameter of the circle is 25 cm, what is its radius?12.5 cm18125 cm1.25 cm Q 4: A circle has a radius of 3 feet. What is the area of the circle?188 square feet9.32 square feet28.26 square feet18.84 square feet Q 5: If the circumference of a circle is 62.8 centimeters, what is the area?3140 square centimeters313.72 square centimeters197.192 square centimeters350.7 square centimeters Q 6: A circle has a diameter of 5 inches. What is the area?157 square inches19.625 square inches196.25 square inches15.7 square inches Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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