If the area of \( \triangle PQR \) above is \(12\sqrt{3}\text{ cm}^2\), find the value of q?

Assessment: JAMB UTME - Mathematics - 2010 Subject: General Mathematics

Question 1 Report

If the area of \( \triangle PQR \) above is \(12\sqrt{3}\text{ cm}^2\), find the value of q?

Answer Details
Let A denote the area of  △ PQR, then A =  1 2 b h

Using Sin 60 ∘  =  h q

h = q sin 60 ∘

So A =  1 2 b ( q sin ⁡ 60 o )

12 3 = 1 2 × 8 × q × 3 3

12 3  - 2q 3

q =  12 2 = 6 cm

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