Question

5. The diameters of two silver discs are in the ratio 2:3. What will be the ratio of the their areas?​

Answer 1

Answer:

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Answer 2

Answer:

4 : 9

Step-by-step explanation:

diameter of 1st disc = 2 , so radius ,r = 1

diameter of 2nd disc =3 , so radius ,R = 3/2

Area of 1st disc = πr² = π ( 1 )²

Area of 1st disc = π unit²

Area of 2nd disc = πR² = π ( 3/2)²

Area of 2nd disc = 9π/4

so ratio of their areas = πr² : πR²

Ratio = r²: R²

Ratio = 1: 9/4

Ratio = 4 : 9

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