Classifying Triangles

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Description and Tags

Geometry & Trigonometry

Right Triangles & Trigonometry

9th

15 Terms

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Polygon
a closed figure made up of sides and angles
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Triangle
a three sided polygon
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Triangle classification
number of congruent sides and types of angles
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Hypotenuse
the side opposite to the right angle
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Right Angle legs
two sides adjacent to the right angle
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Isosceles base
the side opposite the vertex angle
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Isosceles legs
the two congruent sides
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Vertex Angle
the angle formed by the two legs
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Base Angles
the two angles formed by the base and legs
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Angle Corollary
there can be at moat one right angle or one obtuse angle in a triangle
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Exterior Angle
an angle formed by extending the side of the triangle
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Right Angle Corollary
in a right angle the two acute angles are complementary
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Triangle Angle Sum Theorem
the sum of the interior angles of a triangle is 180°
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Exterior Angle Theorem
the measure of the exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles
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Isosceles Triangle Theorem
in an isosceles triangle the two angles opposite the congruent sides are congruent