Question

In a circle of radius 28 cm, an arc subtends an angle of 45° at the centre, then find the length of the

arc (in cm).​

Answer 1

Sector (OAPBO) of a circle is given whose
radius(r)=28cm
and central angle (θ)=45
∘

∴ Area of sector (A)=
360
∘

πr
2
θ
​

=
7
22
​
×
360
∘

28×28×45
∘

​

⇒ Area of sector =308cm
2
is the required area.
solution