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)
Diagram 6 shows a triangle ABC. Given that the area of triangle ABC is 21 cm2 and ∠BAC is obtuse angle.
![](http://spmaddmaths.blog.onlinetuition.com.my/wp-content/uploads/sites/3/2022/03/Picture9.png)
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)