Question

ABCD is a rectangle. If BD = 15 m and AD = 12 m, what is the length of CD?

Answer 1

Answer:

9m

Step-by-step explanation:

In rt triangle ABD, AD=12m, BD= 15m, AB= B= ?

By pythagoras theorem,

H square = P square+ B square

15 square = 12 square + B square

225 = 144 + B square

B square = 225 - 144

B square = 81

B = 9m

Therefore, AB= 9m

If AB is 9m, then CD is also 9m, because opposite sides of a rectangle are always equal.

Answer 2

Answer:

9m is the correct answer.