Question

The ratio of diameters of two circles is 10:18. Find the ratio of their areasThe ratio of diameters of two circles is 10:18. Find the ratio of their areas​

Answer 1

Answer:

25:81

Step-by-step explanation:

As there diameters are in ratio 10:18, there radius will be in the same ratio.

Let the radii be 10x and 18x.

Area of a circle is πr².

Ratio of their areas will be π(10x)²/ π(18x)²

=> 100x²/324x²

=> 100/324= 25/81.