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27 terms

Triangle with one right angle

Right Triangle

Triangle that has exactly one obtuse angle

Obtuse Triangle

Angles with the same measure

Congruent Angles

On the same plane

Coplanar

An angle whose measure is between 0 and 90 degrees

Acute Angle

The longest side of a right triangle; the side opposite 90 degrees

Hypotenuse

A point that divides a segment into two congruent segments

Midpoint

An angle whose measure is 90 degrees

Right Angle

Lines NOT in the same plane that do not intersect

Skew Lines

Triangle whose angles are all congruent

Equiangular

Triangle whose sides are all congruent

Equilateral

Has an endpoint and extends infinitely in 1 direction

Ray

If two lines are parallel and cut by a transversal, these angles are supplementary

Same-Side Interior

Polygon with 3 sides

Triangle

The sides with the same measure in an isosceles triangle

Legs of an Isosceles

In a triangle, the side between two consecutive angles

Included Side

A pair of angles whose sum is 90 degrees

Complementary

A pair of angles whose sum is 180 degrees

Supplementary

Switches the hypothesis and the conclusion

Converse

ONE angle whose measure is 180 degrees

Straight Angle

Lines in the same plane that do not intersect

Parallel Lines

Angles on the base of an Isosceles Triangle

Base Angles of an Isosceles

Angles on opposite sides of the transversal, located on the INSIDE of parallel lines

Alternate Interior Angles

In a triangle, the angle between two sides

Included Angle

Triangle with three acute angles

Acute Triangle

Triangle with two congruent sides

Isosceles Triangle

The side opposite the vertex angle in an isosceles triangle

Base of an Isosceles