TRIANGLES

1
TRIANGLES

• Whats my name?

2
The sum of the anglesis always 180
3

• Triangles

4
Name the missing angle

• 90 , 30 , _____
• 60
• 40 , 100 , _____
• 40
• 20 , 30 , _____
• 130
• 110 , 10, _____
• 60

5
Tri-Angle Names

• Acute Triangle Must have 3 acute angles.
• Right Triangle Has one right angle.
• Obtuse Triangle Has one obtuse angle.
• Every triangle has at least 2 acute angles.
• The third angle is what gives it a name.

6

• Tri-angle names

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Triangle SIDE names

• Equilateral triangle All 3 sides are equal.
• Isosceles triangle Two sides and two angles are
  equal in measure.
• Scalene triangle No sides and no angles are
  equal in measure.

8

• Name the triangle

9
Can the following triangles exist?

• A right isosceles triangle?
• A right equilateral triangle?
• A right scalene triangle?
• An acute scalene triangle?
• An acute isosceles triangle?
• An obtuse scalene triangle?
• An obtuse isosceles triangle?
• An obtuse equilateral triangle?
• An acute equilateral triangle?