Answer:
12
Step-by-step explanation:
Is there a picture to go with this problem?
Because it’s an equalacteral it should be 60
18=r/2
Multiply by 2 on each side,
36=r
r=36
Hope this helps.
Answer:
Area= 28.274 
Perimeter= 21.425 cm
Step-by-step explanation:
This is a quadrant.
Formula for area of a quadrant= 
Area= 
Area= 28.274 
Formula for perimeter of a quadrant= 
r=6cm
Perimeter= 
Perimeter= 21.425 cm