Question

A chord is 10cm from the centre of a circle of radius 15cm. Find the length of the chord.

Answer 1

Answer: 21.44 cm

Explanation:

Given

Radius r=15 cm

distance of chord from the center is 10 cm

From the figure, the length of the chord is AC

Applying Pythagoras

`\Rightarrow AO^2=OB^2+AB^2\\\Rightarrow AB^2=15^2-10^2\\\Rightarrow AB^2=225-100=115\\\Rightarrow AB=√(115)=10.72\ cm`

The length of the chord is
`AC=2AB=21.44\ cm`