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justify

show or prove to be right

conjecture

an opinion or conclusion formed on the basis of incomplete information

triangle

a plane figure with three sides and three angles

obtuse

4.greater than 90° and less than 180

acute

greater than 0° and less than 90°

right angle

an angle that measure 90°

isosceles

a triangle with two congruent sides

equilateral

a triangle with all sides congruent

scalene

a triangle with no congruent sides

protractor

an instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge

supplementary

either of two angles whose sum is 180°

complementary

either of two angles whose sum is 90°

quadrilateral

a four sided figure

angle measure

the measure of an angle