Discussion
The sum of all angles of a triangle is :
Answer: C
The sum of the angles of a triangle is 180°.
Draw a line through one vertex parallel to the opposite side. The three angles at that vertex, which lie along the straight line, are equal to the three angles of the triangle (alternate angles), and angles on a straight line add up to 180°.
60° is one angle of an equilateral triangle, 90° is a right angle, and 360° is the angle sum of a quadrilateral.
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