Question

how do i do this question?

Answer 1

In given radius of area C is 1,B is 2 and A is 3.

Then total area of circular region with radius 3 cm = π(3)2=9π

The area of circular region with radius 2 cm = π(2)2=4π

Then heating area of region A= 9π−4π=5π

Then  probability of a dart hitting board region 

Area of total region A 5π

A = ___________________ = ___ =0.55

total area of circular disc  9π

Then probability of a dart hitting board region A=55%.