Math Test Flashcards
Angle bisector
Cuts angle in half
Perpendicular bisector of a side
Bisects a side/creates a right angle
Median
Vertex to opposite midpoint
Mid segment
Connects midpoints of opposite sides of
Altitude
Height (vertex to opposite side, perpendicular)
Incenter
Intersection of the 3 angles
Circumcenter
Intersection of perpendicular bisectors
Orthocenter
Intersection of the 3 altitudes
Centroid
Intersection of the medians
Properties of the incenter
Center of inscribed circle, equidistant to all sides, cannot be outside of triangle
Properties of circumcenter
Center of circumscribed circle, radius=vertex to circumcenter, equidistant to all vertices, can be inside or outside
Properties of orthocenter
Can be inside or outside
Properties of centroid
Center if gravity, always inside triangle, medians divide triangle into two smaller triangles with equal area, 2/3 median from vertex
Sun of interior angles
180(n-2)
Measure of one interior angle
180(n-2)
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