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Step-by-step explanation:
let ratio be 1x:2x:1x
1x+2x+1x=180°
4x=180°
x=180°/4
x=45°
hence,middle angle =2x=90°
Answer:
let those three angles be 1x, 2x, 1x then according to the angle sum property of
a triangle
x + 2x + x = 180°
4x = 180°
x = 180°-4
45°
so the angles are 45°, 45°, 2x45°= 90°