Question

Example 6 : In A ABC, right-angled at B,
AB = 5 cm and ACB = 30° (see Fig. 8.19).
Determine the lengths of the sides BC and AC.
10th trigono....
clear explanation plzz​

Answer 1

we r finding sin or cos bcoz one angle is given , and only one side . zo if one more side were given , we could have have used pythagoras theorem . but since it is not given , and instead an angle is given, we are left with no other option but use trigonometrical identities. And sin theta or sin 30°= perpendicular/ hypotenuse, so we can use this to find AC.and cos theta or 30° = base/hypotenuse, so we can use this to find BC .

Answer 2

Answer:

hope this will help you