In the diagram above, ∠PRQ = 90^\circ, ∠QPR = 30^\circ and /PQ/ = 10 cm. Find y.
Attached Figure / Diagram
A
6cm
B
5cm
C
4cm
D
3cm
E
2cm
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
\(\sin 30^\circ = \frac{y}{10}\)
\(y = 10 \sin 30^\circ = 10 \times 0.5 = 5 cm\)
Source: Myschool Past Questions Archive (Record #23784)