If the radius is 21cm and the angle at center of the circle is 140° then the length of arc is ...

51.33 cm

Step-by-step explanation:

Step 1: Check what is given and asked to find out. In this problem we are provided with the radius 21 cm and the angle at center of the circle is 140°.

→ radius (r) = 21 cm and angle (Ø) = 140°

To find: length of arc (l).

Step 2: Do the calculations. But before that we need to know that which formula we are going to use to do the calculations.

Formula: l = 2πr Ø/360°

Let's dive in!

→ l = 2 × 22/7 × 21 × 140°/360°

→ l = 44 × 3 × 7/18

→ l = 924/18

→ l = 51.33

Hence, the length of the arc is 51.33 cm.

x + 4/7

step-by-step explanation:

use cymath