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# 9 5 triangles

## by bigsis on Jun 18, 2010

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This slide show was prepared to help my fourth grade students understand and identify the different types of triangles and to help them with their homework.

This slide show was prepared to help my fourth grade students understand and identify the different types of triangles and to help them with their homework.

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## 9 5 trianglesPresentation Transcript

• TOPIC 9 LESSON 9-5
Triangles
• Triangles can be classified by their sides.
3
equal
sides
equilateral triangle
• Triangles can be classified by their sides.
2
equal
sides
isosceles triangle
• Triangles can be classified by their sides.
0
equal
sides
scalene triangle
• Triangles can also be classified by their angles.
1
right
angle
right triangle
One angle measures 90 degrees. The other 2 are acute or less than 90 degrees.
• Triangles can also be classified by their angles.
3
acute
angles
acute triangle
All angles measure less than 90 degrees.
• Triangles can also be classified by their angles.
1
obtuse
angle
obtuse triangle
One angle measures greater than 90 degrees.
• Classify this triangle by its sides and angles.
• Did you say. . .
equilateral, acute?
3 equal sides, 3 acute angles
• Classify this triangle by its sides and angles.
• Did you say . . .
isosceles, right?
2 equal sides, one right angle
• Classify this triangle by its sides and angles.
• Did you say . . .
scalene, obtuse?
0 equal sides, 1 obtuse
angle
• Can you classify this triangle by its sides and angles?
• Did you say . . .
scalene, right?
0 equal sides,1 right angle
• Classify this triangle by its sides and angles.
• Did you say. . .
isosceles, acute
2 equal sides, 3 acute angles
• Now you know how to identify triangles.