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
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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.
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