Two angles whose sum is 180 degrees.
EX: <ACB + <BCD = 60 + 120 = 180 degrees.
Two angles whose sum is 90 degrees.
An angle less than 90 degrees but more than 0 degrees.
An exact location in space.
An angle whose measure is greater than 90 degrees, but less than 180 degrees.
A straight path that extends without end in opposite directions.
An angle that measures 90 degrees.
(mathematics) a straight line extending from a point
(mathematics) an unbounded two-dimensional shape
a pair of opposite congruent angles formed by intersecting lines
coplanar lines that do not intersect
Two lines that intersect to form right angles
a triangle whose interior angles are all acute
a triangle with one obtuse angle
a triangle with three congruent sides
a triangle with two congruent sides
a triangle with no two sides of equal length