a triangle ABC, BC = 8cm, AC = 12cm and angle ABC = 120º.

Question

Calculate the of AB, correct to one decimal place.

(b) If BC is the base of the triangle, calculate, correct to one decimal place:

(i) the perpendicular height of the triangle;

(ii) the area of the triangle;

(iii) the size angle ACB

Answer 1

Have you drawn out the triangle as a start?

Answer 2

AB = 12 cos60º
(i) 12 sin60º
(ii) A = 1/2 * BC * (i)
(iii) sinC = (ii)/((i)+8)

Answer 3

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