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Geometry Chapter 4 Terms

AB
A triangle with all three congruent sidesEquilateral Triangle
A triangle with two congruent sidesIsosceles Triangle
A triangle with no congruent sides (all of the sides are different)Scalene Triangle
A triangle with all three angles congruentEquiangular Triangle
A triangle with all angles acuteAcute Triangle
A triangle with one right angleRight Triangle
A triangle with one obtuse angleObtuse Triangle
The two congruent segments in an isosceles triangleLeg (Isosceles Triangle)
The two segments that form the right angle in a right triangleLeg (Right Triangle)
The two angles opposite the congruent segments of an isosceles triangle (base angles) are congruentBase Angles Theorem
If the hypotenuse and one leg of a right triangle are congruent to the hypotenuse and one leg of another right triangle, then the triangles are congruent.Hypotenuse Leg Theorem (or HL
c^2 = a^2 + b2Pythagorean theorem
AB = (square root of: (x1-x2)squared +(y1-y2) squared )Distance Formula
The segment of a triangle from a vertex to the midpoint of the opposite sideMedian
The intersection of the three medians of a triangleCentroid
The sum of the interior angles of a triangle is 180 degreesTriangle Sum Theorem
A triangle’s exterior angle is the sum of the opposite two interior anglesExterior Angles Theorem
The sum of the two smaller segments of a triangle must be greater than the third sideTriangle Inequality

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