Geometry Vocabulary

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4.5, 4.6, 5.1, 5.2, 5.3, and 5.4

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39 Terms

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Isosceles Triangle
Triangle with two congruent sides
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Equilateral Triangle
Triangle with all congruent sides
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Opposite Side
A side located to the opposite direction of a specific angle
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Opposite Angle
An angle located to the opposite direction of a specific side
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Corollary
A theorem that can be used to prove another theorem
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Parts of an Isosceles Triangle
Base

Legs

Vertex Angle

Base Angles
Base

Legs

Vertex Angle

Base Angles
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Base
Non-congruent side
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Legs
Congruent sides
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Vertex Angle
Angle between the 2 legs
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Base Angles
Angles between the base and the legs
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Isosceles Angle Theorem
If two sides of a triangle are congruent, then the angles opposite to those sides are congruent
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Converse of the Isosceles Angle Theorem
If two angles of a triangle are congruent, then the sides opposite to those angles are congruent
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Theorem 4.5
If a line bisects the vertex angle of an isosceles triangle, then the line is also a perpendicular bisector to the base
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Corollary of Theorem 4.3
If a triangle is equilateral, then the triangle is also equiangular
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Corollary of Theorem 4.4
If a triangle is equiangular, then the triangle is also equilateral
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Right Triangle
Triangle that has 1 right angle
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Hypotenuse
A side located to the opposite direction of the right angle in a right triangle
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Legs (Right Triangle)
Sides that are not the hypotenuse
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Hypotenuse-Leg Theorem (HL)
If the hypotenuse and the leg of one triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangle are congruent
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Triangle Midsegment Theorem
If a segment joins the midpoint of two sides of a triangle, the the segment is parallel to the third side, and is half long.
If a segment joins the midpoint of two sides of a triangle, the the segment is parallel to the third side, and is half long.
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Perpendicular Bisector
Line that cuts another line into 90° angles
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Angle Bisector
Line that cuts an angle in half
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Equidistant
Something that is at the same distance from 2+ figures
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Distance
Perpendicular segment from the point to the line. At the same time, the distance did the shortest segment from said point to said line.
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Perpendicular Bisector Theorem
If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segments
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Converse of the Perpendicular Bisector Theorem
If a point is equidistant from the endpoints of the segments, then it is on the perpendicular bisector of a segment
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Angle Bisector Theorem
If a point is on the bisector of an angle, then the point is equidistant from the sides of the angle
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Converse of the Angle Bisector Theorem
If the point on the interior of an angle is equidistant from the sides of the angle, then the point is on the bisector of an angle
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Concurrency
When 3+ lines intersect at one point. The point where they intersect is the **point of concurrency**.
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Concurrency of Perpendicular Bisectors Theorem
The perpendicular bisectors of the sides of a triangle are concurrent at a point equidistant to the vertices
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Circumscribed
Point of concurrency of the perpendicular bisector of a triangle. If you trace a circle around the vertices of a triangle, the point of concurrency is also the center of said circle.
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Concurrency of Angle Bisectors Theorem
The angle bisectors of a triangle are concurrent at a point equidistant to the sides of the triangle
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Inscribed
The point of concurrency of the angle bisectors of a triangle is called the incenter. This is because if you trace a circle that touches all the sides of the triangle, the point of concurrency is the center of said circle.
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Median of a Triangle
Segment whose endpoints are the vertex and the midpoint of the opposite side of a triangle
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Centroid of a Triangle
Point of concurrency of the medians of a triangle (always inside)
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Concurrency of Medians Theorem
The medians of a triangle are concurrent at a point (centroid) that is at the 2/3 the distance between the vertex and the midpoint of the opposite side
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Altitude of a Triangle
A perpendicular segment from a vertex of a triangle to a line contained in the opposite side. It can be inside, on or outside the triangle
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Orthocenter of a Triangle
The point of concurrency of the altitudes of a triangle. Inside, outside or on the triangle
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Concurrency of Altitudes Theorem
The lines that contain the altitudes of a triangle are concurrent at an orthocenter