Question

In a circle of diameter 40cm the length of chord is 20 .find the length of minor arc of chord

Answer 1

I think this is the easiest method

Answer 2

Given :

Diameter=40cm

Length of the chord=20cm

Radius=20cm

Since radius=length of chord=20cm

Hence the formed ΔΔle in the circle is equilateral ΔΔle

⇒θ=60∘⇒θ=60∘

We know that l=rθl=rθ

l=20×60∘×π180∘l=20×60∘×π180∘

l=20π3l=20π3

Thus length of the minor arc of the chord is 20π3