Question

hey guys,
please help me!

Answer 1

I hope this helps you!
@vaibhav246

Answer 2

since the sum of interior angles of triangle is 180° that gives angle B = 180° - 90° - 30°
angle B = 60°
now sinB = AC/AB
sin 60° = AC / 40
√3/2 = AC /40
AC = 20√3
similarly
cos B = BC / AB
cos 60° = BC/AB
1/2 = BC /40
BC = 20
hope it helps.