Question

Perimeter is 40cm, find radius of the sector:

Answer 1

Step-by-step explanation:

1. here it is a sector of 72°
2. so the length of arc will be 72/360 i.e. 1/5 of 40cm
3. i.e. 8cm
4. 8cm = 72/360 × 2πr
5. i.e. 2/5×22/7×r = 8
6. so r = 6.363cm