angle A + angle B + angle C = 180° [Sum of all angles of a triangle is 180°]
=> 2x+1 + x+15 + x = 180°
=> 4x + 16 = 180°
=> 4x = 180° - 16°
=> 4x = 164°
=> x = ([tex]\frac{164}{4}[/tex])°
=> x = 41°
[tex]\\[/tex]
angle A = 2x+1 = 2×41 +1 = 82 + 1
=> 83°
angle B = x+15 = 41+15
=> 56°
angle C = x
=> 41°
[tex]\\\\\\[/tex]
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