| Classifying
Triangles
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Classifying
Triangles
|
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Students
should be able to:
Classify and describe
triangles by using their properties; e.g., interior
angle measures, congruent angles/sides.
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Triangles
are classified by the length of their sides and angle measures:
- Equilateral
- Iscosceles
- Scalene
Triangles can also be classified
only by the measure of their angles:
Classifying
Triangles by Sides and Angles
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| Click
on the sides button to see the equal sides
and the angles button to see the equal angles.
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| More
on Equilateral Triangles
- Because they are equal, or
congruent, the measure of each angle in
an equilateral triangle is 60º. This means that an equilateral
triangle is also equiangular.
- If each angle is congruent,
then each side is also congruent.
- To show that a triangle is
equilateral, we use the following symbols:
|
|
| Click
on the sides button to see the equal sides
and the angles button to see the equal angles.
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| More
on Isosceles Triangles
- The two equal sides are called
the legs of the triangle. The third side
is called the base.
- If the legs of the triangle
are congruent, then the angles opposite each leg are congruent.
- To show that a triangle is
isosceles, we use the following symbols:
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Scalene Triangle
No Sides Equal
No Angles Equal
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| There are no
buttons to click here. |
More
on Scalene Triangles
- Though the angles all have
different measures, they still must add to 180³.
- To show that a triangle is
scalene, we use the following symbols:
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Everything
Geometry
The Basics| Classifying
Quadrilaterals | Classifying
Triangles
Area
& Perimeter | Angles
| Circles
|
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