Is right triangle

One angle of the triangle is 36° and the remaining two are in the ratio 3:5. Determine whether triangle is a rectangular triangle.

Correct answer:

a =  54 °
b =  90 °

Step-by-step explanation:

a+b=180-36
5a=3b

a+b=180-36
5•a=3•b

a+b = 144
5a-3b = 0

a = 54
b = 90

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