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4.1 - Triangles and Angles
Geometry
10
Other
10th Grade
11/11/2009
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Term

equilateral triangle

 Definition

[image]

3 congruent sides
Term
isosceles triangle
 Definition

[image]

At least 2 congruent sides
Term
scalene triangle
 Definition

[image]

No congruent sides
Term
acute triangle
 Definition

[image]

3 acute angles
Term
equiangular triangle
 Definition

[image]

3 congruent angles
Term
right triangle
 Definition

[image]

1 right angle
Term
obtuse triangle
 Definition

[image]

1 obtuse angle
Term
Triangle Sum Theorem
 Definition

The sum of the measures of the interior angles of a triangle is 180°.

m<A + m<B + m<C = 180°
Term
Exterior Angle Theorem
 Definition

The measure of an exterior angel of a triagle is equal to the sum of the mesures of the two nonadjacent interior angles.

m<1 = m<A + m<B
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