1.

The difference between circumference and diameter of a circle is 21.4cm find the radius​

Answer»

Given,

πr² - 2πr = 21.4

π (r² - 2r) = 21.4

r² - 2r = 21.4 × 7/ 22

r² - 2r = 6.80

r² - 2r - 6.8 = 0 (QUAD. EQN)

R = 3.792, -1.79

Since the value of radius cannot be Negative, therefore r = 3.79.

Radius = 3.79 CM



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