An exterior angle of a triangle is 105 degree . One of its interior opposite angle is 60dgrees. Find all angles of triangle
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Answer:a=60°
ext angle + int angle = 180°
105 + int angle = 180°
Int angle = 180 - 105 =75°
b=75°
Step-by-step explanation:sum of int angles of a triangle= 180°
Angle a + angle b + angle c = 180°
60 + 75 + angle c = 180°
135 + angle c = 180 °
Angle c = 180 - 135 = 45°
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