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Presentation transcript:

Angles in a triangle add up to 180°

Angles in a triangle add up to 180°

Angles in a triangle add up to 180°

Angles in a triangle add up to 180°

Angles in a triangle add up to 180°

Properties of Triangles

Properties of Triangles Types of Triangles Isosceles triangle 2 equal sides 2 equal angles (base) Equilateral Triangle 3 equal sides 3 equal angles. Scalene triangle 3 unequal sides 3 unequal angles

Any triangle containing a 90o angle is a right-angled triangle An isosceles or a scalene triangle may contain a right angle. Right-angled isosceles triangles. Right-angled scalene triangle.

How can we use this to help us? To determine the angle sum of any Triangle How can we use this to help us? Take 3 identical copies of this triangle and put them together, so: 3 1 2 Angles on a straight line add to 180o These are the same angles as in the triangle! Angles in a triangle add up to 1800

1. 2. 3. 4. 5. Types of Triangles Equilateral Triangle 3 equal sides 3 equal angles. Isosceles triangle 2 equal sides 2 equal angles (base) Scalene triangle 3 unequal sides 3 unequal angles 1. 2. 3. 4. 5. Any triangle containing a 90o angle is a right-angled triangle The angle sum of a triangle = 1800