# Angle

Determine the size of the smallest internal angle of a right triangle which angles forming the successive members of the arithmetic sequence.

a =  30 °

### Step-by-step explanation:

a+b+c=180
c = 90
b-a = c-b

a+b+c = 180
c = 90
a-2b+c = 0

a = 30
b = 60
c = 90

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