Properties of Triangles
1. The sum of three angles of a triangle is 180°
2. A triangle cannot have more than one right angle.
3. In a right triangle, the sum of the two acute angles are 90°.
4. A triangle cannot have more than one obtuse angle.
5. Angles opposite to two equal sides of a triangle are equal.
6. Exterior Angle Theorem: If a side of a triangle is produced, the exterior angle so formed i~ equal to the sum of the two interior opposit: angles.
∠ACD is exterior angle deroled by exterior ∠ACD.
Exterior angle of triangle is greater than either 6f the interior opposite angles.
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