Term
An equilateral triangle is isosceles. 

Definition


Term
An angle has a complement 

Definition


Term

Definition


Term
an angle is equal to its supplement 

Definition


Term
a right triangle is isosceles 

Definition


Term
the complement of an acute angle is an obtuse angle 

Definition


Term
two lines perpendicular to a third line are skew 

Definition


Term
two skew lines are coplanar 

Definition


Term
if two angles have a common side, the angles are adjacent 

Definition


Term
the supplement of an obtuse angle is an obtuse angle 

Definition


Term
complementary angles are congruent to each other. 

Definition


Term

Definition


Term
supplementary angles are adjacent. 

Definition


Term
congruent angles are supplementary 

Definition


Term

Definition


Term
three parallel lines are coplanar 

Definition


Term

Definition


Term
if the diagonals of a quadrilateral are perpendicular, the the quad is a rhombus. 

Definition


Term
the diagonals of a rectangle bisect each other 

Definition


Term
a trapezoid with three congruent sides is isosceles 

Definition

