Question

Is anyone able to help with any of these?

Answer 1

Answer:

1-

sinA = perpendicular / hypotenuse

sinA = 40 / 50 OR 4/5

cosA = base / hypotenuse

cosA = 30 / 50 OR 3/5

ANS - OPTION(D) 4/5 , 3/5

2-

ANS - OPTION(C) √2 (You will need to learn the trigo angle tables for these questions)

3-

Using Pythagoras theorem-

15^2 = b^2 + 9^2

225 = b^2 + 81

b = √144

b = 12

OPTION(C) b = 12

4-

First we need to find the height of the triangle. To do that we need to take the triangle on the left and use cos30

cos30 = b / 6

√3/2 = b /6

3√3 = b

b = 3√3

and now we can use tan45

tan45 = 3√3 / x

1 = 3√3/x

x = 3√3

ANS - OPTION(A) 3√3

Hope this helps!!!