Question

1) AABC ~ ADEF, ar (AABC)/ar(ADEF)=9/25 BC = 21 cm, then EF is equal to
(a) 9 cm
(b) 6 cm
(c) 35 cm
(d) 25 cm​

Answer 1

Answer:

(c) 35cm

Explanation:

Since, ABC~DEF

So, their area is equal to square of the ratio of their corresponding sides.

Now, ar(ABC) /ar(DEF) =BC^2/EF^2

9/25= 21^2/EF^2

By both side square rooting,

3/5= 21/EF

EF= 21/3*5

EF= 35cm