1.

Find the circumference and area of a circle of diameter 28 cm.

Answer»

Given that diameter of the circle is 2r = 28 cm. 

Therefore, the radius of the circle is r = \(\frac{28}{2}\) = 14 cm. 

The circumference of the circle is 2\(\pi r\) = 28\(\pi\) cm. 

And the area of the circle is \(\pi\)r2 = \(\pi\)(14)2 = 196\(\pi\) cm2



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