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Grade 8 - Mathematics3.31 Area of a Circle - 2

 Example: The circumference of a circle is 56.6 cm. Find its area. Solution: If r is the radius of a circle, we have Circumference (C) = 2pr Therefore, the area of the circle = p r2 A = p(C/2p)2 A = C2 / 4p Given that, C = 56.5cm. A = (56.5)2/4 * 7/22 A = 22345.75/ 88 A = 253.93 Sq. cm. Therefore, the area of he circle (A) = 253.93 Sq. cm. (Answer is corrected by two decimal place) Directions: Solve the following problems and correct the answer two decimal places. Also write at least ten examples of your own.

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Grade 8 - Mathematics3.31 Area of a Circle - 2

 Q 1: The circumference of a circle is 36.5 cm. Find its area.107.97 Sq.cm.105.97 Sq.cm.106.97 Sq.cm.104.97 Sq.cm. Q 2: The circumference of a circle is 49.7 cm. Find its area.196.48 Sq.cm.194.48 Sq.cm.195.48 Sq.cm.197.48 Sq.cm. Q 3: The circumference of a circle is 44.8 cm. Find its area.156.65 Sq.cm.None of these159.65 Sq.cm.158.65 Sq.cm. Q 4: The circumference of a circle is 78.4 cm. Find its area.489.93 Sq.cm.488.93 Sq.cm.486.93 Sq.cm.487.93 Sq.cm. Q 5: The circumference of a circle is 28.6 cm. Find its area.63.07 Sq.cm.64.07 Sq.cm.66.07 Sq.cm.65.07 Sq.cm. Q 6: The circumference of a circle is 64.7 cm. Find its area.332.98 Sq.cm.333.98 Sq.cm.331.98 Sq.cm.None of these Q 7: The circumference of a circle is 19.5 cm. Find its area.28.25 Sq.cm.31.25 Sq.cm.29.25 Sq.cm.30.25 Sq.cm. Q 8: The circumference of a circle is 58.6 cm. Find its area.273.16 Sq.cm.272.16 Sq.cm.274.16 Sq.cm.271.16 Sq.cm. Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!