Angles
Triangles
Polygons
Extras
100
An angle that measures less than 90 degrees.
Acute angle
100
A triangle with all equal sides and angles.
Equilateral triangle
100
A figure with four angles.
Quadrangle
100
A synonym for congruent.
Equal, same size/shape, identical
200
An angle with a measure of exactly 90 degrees.
Right angle
200
A triangle that has at least two sides that are equal.
Isosceles triangle
200
A figure with at least one pair of parallel sides.
Square, rectangle, trapezoid, rhombus, ...
200
What is the measure of Angle x?
15 degrees
300
An angle that has a measurement greater than 90 degrees but less than 180 degrees.
Obtuse angle
300
A triangle with three sides that are all different lengths.
Scalene triangle
300
A polygon that has all equal sides.
Regular polygon
300
Angles 1 and 3 are called ____ or ____ angles because they are across from each other.
vertical or opposite
400
An angle with a measure of exactly 180 degrees.
Straight angle
400
The sum of the interior angles of a triangle.
180 degrees
400
A figure with five sides of equal length.
Regular pentagon
400
Angle a and Angle b are called ______ angles because they share a side.
adjacent
500
An angle that measures greater than 180 degrees but less than 360 degrees.
Reflex angle
500
The measure of each angle of an equilateral triangle.
60 degrees
500
A figure with a set of parallel and a set of perpendicular lines.
Rectangle
500
Repeated shapes that cover a surface with NO gaps or overlaps between shapes.
Tessellation