##### Geometry Notecards (5th grade Math)

Acute Angle

an angle that is less than 90 degrees

Obtuse Angle

an angle that is between 90 and 180 degrees

Straight Angle

an angle that is exactly 180 degrees

Right Angle

an angle that is exactly 90 degrees

Ray

a part of a line that begins at one point and extends forever in one direction.

Line

a set of points that form a straight path. A line extends forever in both directions.

Angle

is formed by two rays that share an endpoint or vertex

Complementary Angle

two angles that add/sum to 90 degrees

Supplementary Angles

two angles that add/sum to 180 degrees

Vertical/Opposite Angles

pairs of opposite angles formed by intersecting lines

Congruent

When 2 shapes are the same size AND the same shape

Line Symmetry

a figure that can be folded in half so that the two parts match exactly