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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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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