Question

In
∆LMR, LM = 10 cm MR = 12 cm and LR = 8cm,
find out the greatest angle of the triangle .
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Answer 1

Answer:

Step-by-step explanation:

Here Cosine law will help

Angle opposite greatest side is greatest angle.

Hence let angle x be Opp to MR.

So according to cosine law

Cos x =(LM^2+LR^2-MR^2)/2*LM*LR

Cos x= 100+64-144/2*10*8

Cos x = 20/160

Cos x=1/8

hence x ≈ 83