Question

Help me plz need help

Answer 1

Explanation:

use the area of a circle formula

A=pi r^2

78.5= pi r^2

78.5/ pi =r^2

24.9873..=r^2

`√(24.9873)` = r

4.9987...=r in meters , pretty close to 5

Answer 2

Concept: Area

1. 
   `area = \pi {r}^(2)`
2. We are given area hence 78.5 square meters
3. We want the radius so we isolate
4. 
   `78.5 = \pi {r}^(2)`
5. Isolate for r to get r= 4.99 or 5 square units approximately