Calculate the length of an arc of a circle diameter 14 cm, which substends an angle of 90

^{o}at the center of the circle-
**A.**

7π/2 cm -
**B.**

7π cm -
**C.**

14π cm -
**D.**

7π/4 cm

##### Correct Answer: Option A

##### Explanation

Length of an arc = θ/360 x 2πr

90/360 x 2 x π x 7

= ^{7π}/_{2}