theoroms Flashcards
isosceles triangle theoreom
if two of the top lines are congruent then the base angles are
converse of the isosceles triangle theorom
if both base angles are congruent, then the top lines are
triangle angle-sum theorom
in triangle dbc, <dbc + <cdc + <bcd= 18-
corallary to isoscels triangle theorok
if a triangles is equilateral. it is equiangular
corallary to converse of isoscels triangle theorom
if a triangle is equiangular , it is equilateral
hypotenuse-leg theorom
if the hypotenuse and a leg of one right triangle are congruent to the hypotenuse and leg of another right triangle then the triangles are congruent
angle- addition postulate
the sum of two adjacent angle measures will equal the angle measure of the larger angle that they form together
triangle midsegment theorem
if a segment joins the midpoints of two sides of a triangle, then the segment is parallel to the third side and is half as long
polygon angle-sum theorem
the sum of the interior angles of an n-gon(n-2)180