Geometry Flashcards
A triangle with at least two sides are congruent
isosceles
The congruent sides of an isosceles triangles
legs
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles
Exterior angle theorem
Two triangles are congruent if an only if their corresponding parts are congruent
Def of congruent triangles
Formed by one side of a triangle and the extension of another side
exterior angles
If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent.
ASA
A triangle with three congruent sides
equilateral
If two angles and a nonincluded side of one triangle are congruent to two angles and a nonincluded side of another triangle then the triangles are congruent
AAS
If the hypotenuse and leg of a right triangle are congruent to the hypotenuse and leg of another right triangle, then the triangles are congruent
HL
The sum of measures of the angles of a triangle is 180
Triangle sum theorem
If the sides of one triangle are congruent to the sides of a second triangle, then the triangles are congruent.
SSS
