Question

Determine the length of side QS.
A) 1.9
B) 3.4
C) 2.4
D) 5.7

Answer 1

1.4^2 + 1.2^2 = 3.4
square root 3.4 = 1.84
Answer = A-1.9

Answer 2

Answer: C) 2.4

Given one opposite angle, two known sides and one missing side.

Hence use cosine rule:

`\sf c = √(a^2 + b^2- 2ab \ cos\theta)`

insert values

`\sf c = √(1.2^2 + 1.4^2- 2(1.2)(1.4) \ cos(134))`

simplify

`\sf c = 2.3945 \quad \approx \quad 2.4`