Question

If area of a circular skating rink is 78.5sq m find its diameter (plz explain as well)

Answer 1

Answer:

A = πr²

√A/π = r .... (1)

d = 2r........(2)

put equation 1 in 2

d = 2 × √A/π

d = 2 × √78.5 × 7 / 22

then d is approx. 9.99746

Answer 2

A = πr²

D=2r

solving for d

d = 2 $\sqrt{a/π}$ =2.

=√78.5/π= 9.99746m

SO,DIAMETER IS 10m AND AREA IS 78.5m²..

regards..❤