Answer:
Step-by-step explanation:
Triangle QRS is a right angle triangle.
From the given right angle triangle
QS represents the hypotenuse of the right angle triangle.
With ∠S as the reference angle,
RS represents the adjacent side of the right angle triangle.
QR represents the opposite side of the right angle triangle.
To determine RS, we would apply
the cosine trigonometric ratio. It is expressed as
Cos θ = opposite side/hypotenuse. Therefore,
Cos 61 = RS/8
RS = 8Cos61 = 8 × 0.4848
RS = 3.8784
To the nearest tenth, it becomes
3.9
