Question

The ratio between the diameters of two circles is 3:5. Find the ratio between their:
radii

Answer 1

ratio of diameter is 3:5
radius is d/2
ratio of radius =3/2:5/2
Ratio of radius is also
$\large\bold{ \frac{3}{5}}$

Answer 2

let diameter of one circle = 3x

let diameter of other circle = 5x

radius of first circle = 3x ÷ 2

radius of other circle = 5x ÷ 2

ratio = 3x ÷ 2 : 5x ÷ 2

3 : 5

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