Question

2. The diameters of two circles are 3.5 cm and 4.2 cm. Find the ratio of the area of the smaller circle to that of the bigger circle. ​

Answer 1

Answer:

25:36

Step-by-step explanation:

The ratio will be 25:36.

Given data:

Diameter of the smaller circle = 3.5 cm = 35 mm

Diameter of the bigger circle =4.2cm = 42 mm

So,

Radius of the smaller circle= (35/2) = 17.5 mm

Radius of the bigger circle = (42/2) = 21 mm

Area of the smaller circle = {T (17.5)²) = 962.5

mm²

Area of the bigger circle = { × (21)²) = 1386 mm²

So,

The ratio = 962.5: 1386 = 25:36 (answer)