Question
In a triangle ABC, angle A is half of B and angle C is thrice of A. Find the value of angle A, B and C? [4 MARKS]
Answer: Option A
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Let the value of angle B be y∘
Then, value of angle A=y∘2
And, value of angle C=3y∘2
We know that sum of all angles in a triangle is 180∘.
⇒y∘+y∘2+3y∘2=180∘
⇒3y∘=180∘
⇒y∘=60∘= Value of angle B
So, Value of angle A=y∘2=30∘
Value of angle C=3y∘2=90∘.
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