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Grade 7 - Mathematics9.4 Area of a Circle - II

 Example: The circumference of a circle is 30.8 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 = 30.8 cm. A = (30.8)2/4 * 7/22 A = 6640.48 / 88 A = 75.46 sq cm. Therefore, the area of he circle (A) = 75.46 sq cm. Directions: Read the above example carefully and answer the following questions. Also write at least 10 examples of your own.
 Q 1: The circumference of a circle is 16x cm. Find x if its area is given by 6.16 sq cm.1.23 cm1.09 cmNone of these0.55 cm Q 2: The circumference of a circle is 3.96 cm. Find x if its area is given by 0.4158x sq cm.5 cmNone of these3 cm6 cm Q 3: The circumference of a circle is 22x cm. Find x if its area is given by 38.5 sq cm.3 cmNone of these1 cm2 cm Q 4: The circumference of a circle is 33 cm. Find its area.86.625 sq cm866.25 sq cm8.6625 sq cmNone of these Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!