Question

If the scale factor between two circles is 7a/9b what is the ratio of their areas?

a. 49a/81bB. 49a2/81b2
c. 81b2/49a2D. 81b/49a

Answer 1

b

Explanation:

Answer 2

we know that

the ratio of their areas is equal to the scale factor squared

so

ratio of their areas=scale factor²------> [7a/9b]²------> 49a²/81b²

therefore

the answer is the option

49a2/81b2