Question 28
Triangles and QuadrilateralsFind the value of x in the figure above.
- A.4√3cm
- B.20√3cm
- C.10√3cm
- D.5√3cm
Show the answer and explanation
Answer: C (10√3cm)
Explanation
The third angle is 90°. By the sine rule, x/sin 60° = 10/sin 30°, so x = 10 × (√3/2) ÷ (1/2) = 10√3 cm.