Question

For the given figure BC = 20 cm and A = 30°, then AB =
AC =
(A) 20root3,40
(B) 40, 20root3
(C) 20/root3,40
(D) 40,20/root3​

Answer 1

Answer:

Step-by-step explanation:

B = 90 deg

A = 30 deg

tanA = BC/AB

tan30 = BC / AB

AB = BC/tan30 = BC/(1/root3) = BC root3 = 20root3

And sin30 =BC/AC = 20/AC

so AC= 20/sin30 = 20/(1/2) = 40

Option is A)