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32 terms

Geometry ch. 1-2: Angles and triangles

STUDY
PLAY
point
a location on a plane or in space
Line
The set of all points on a plane in a single path that continues in opposite directions
Plane
The set of al points on a flat surface that extends in all directions
Line segment
Part of a line; Named by two endpoints.
Ray
The set of all points in a single path beginning at an endpoint and continuing in one direction
Angle
The joining of two rays to a common endpoint
Vertex
Endpoint of the angle
Acute
An angle that measures between 0 and 90 degrees
Right
An angle that measures 90 degrees
Obtuse
An angle that measures between 90 and 180 degrees
Straight
An angle that measures 180 degrees
Reflex
An angle that measures more than 180 degrees
Complementary
Two angles whose measures add up to 90 degrees are ____________.
Supplementary
Two angles whose measures add up to 180 degrees are _________.
Vertical
Angles that are nonadjacent that are formed when two lines intersect are __________ angles.
Parallel
Two lines on the same plane that will never intersect are __________ lines.
Corresponding
_________ angles are formed when a transversal cuts two or more other lines; They are on the same side of the transversal on the same side of the parallel line that forms each angle.
Alternate interior
Formed when a transversal cuts two or more lines; Opposite sides of the transversal, but on the einterior of the parallel lines.
Alternate Exterior
Opposite sides of the transversal on the exterior
Perpendicular
lines that meet to form right angles are _________.
Scalene
A triangle whose sides are each different lengths
Isosceles
A triangle in which two sides have the same measure
Equilateral
A triangle that has three congruent sides
Acute
a triangle with three acute angles
Obtuse
A triangle with one obtuse angle and two acute angles
Right
A triangle that contains one right angle and two acute angles. The two acute angles are complimentary.
Isosceles right
A triangle with two congruent sides, a right angle, and two acute angles that are equal in measure.
Scalene right
A triangle that contains sides each with different lengths, a right angle, and two acute angles that are complimentary, but not necessarily congruent.
Isosceles obtuse
A triangle that has two congruent sides, an obtuse angle, and two congruent acute angles.
Isosceles acute
A triangle that has two congruent sides and each of the angles is acute. The two acute base angles are congruent.
Similar figures
Figures that have the same shape, but not necessarily the same size
Similar
Triangles that have corresponding sides, or sides that line up, that are in proportion to each other are ________ triangles.