1.

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​

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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