# Angles ratio

The internal angles of a triangle are in ratio 1:4:5. What kind of triangle is it? (solve interior angles and write down and discuss)

A =  18
B =  72
C =  90

### Step-by-step explanation:

A+B+C = 180
B = 4•A
C = 5•A

A+B+C = 180
4A-B = 0
5A-C = 0

A = 18
B = 72
C = 90

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