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the circumference of a circle is 123.2cm .taking π=22/7 .find the (i) radius of the circle (ii) area of the circle (iii) effect on the area of the circle if radius is doubled |
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Answer» Step-by-step explanation: The radius of given CIRCLE is 5 CM and the area of the circle is 78.5 sq.cm. Step-by-step explanation: Circumference of a circle = 2 \pi r2πr Since w are given that the circumference of circle is 31.4 cm So, 31.4 = 2 \TIMES 3.14 r31.4=2×3.14r \frac{31.4}{2 \times 3.14}= r2×3.1431.4=r [tex5= r[/tex] So, radius of given circle is 5 cm Area of circle = \pi r^2πr2 = 3.14 (5)^23.14(5)2 = 78.578.5 Thus the area of circle is 78.5 sq.cm. |
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