# SPM 2021 Add Maths Trial Paper (Selangor) – Paper 1 (Question 15)

Question 15:
Diagram 6 shows a triangle ABC. Given that the area of triangle ABC is 21 cm2 and ∠BAC is obtuse angle.
Diagram 6

Find
(a) ∠BAC, [3 marks]
(b) the length of BC, in cm, [2 marks]
(c) the length of the perpendicular line from A to BC. [3 marks]

Solution:
(a)

(b)

(c)