Angles
Angles and Lines
Polygons
Triangles
Quadrilaterals
100
An angle whose measure is 90 degrees.
What is a right angle?
100
Two or more lines that lie in the same plane and do not intersect.
What are parallel lines?
100
A five-sided polygon.
What is a pentagon?
100
A triangle with one right angle.
What is a right triangle?
100
A quadrilateral with two pairs of opposite parallel sides.
What is a parallelogram?
200
An angle who measure is less than 90 degrees.
What is an acute angle?
200
Two lines that intersect to form a right angle.
What are perpendicular lines?
200
A polygon whose sides are equal in measure.
What is an equilateral polygon?
200
A triangle with three acute angles.
What is an acute triangle?
200
An equilateral parallelogram.
What is a rhombus?
300
An angle whose measure is greater than 90 degrees.
What is an obtuse angle?
300
Two angles who measures have the sum of 90 degrees.
What are complementary angles?
300
A polyfon in which no diagonal is outside the polygon.
What is a convex polygon?
300
A triangle with one obtuse angle.
What is an obtuse triangle?
300
A quadrilateral with two distinct pairs of consecutive congruent sides.
What is a kite?
400
Two angles with the same measure.
What are congruent angles?
400
Two angles whose measures have the sum of 180 degrees.
What are supplementary angles?
400
A ten-sided polygon.
What is a decagon?
400
A triangle with at least two congruent sides.
What is an isosceles triangle?
400
A quadrilateral with exactly one pair of parallel sides.
What is a trapezoid?
500
An example that proves a statement wrong.
What is a counterexample?
500
A ray that divides an angle in two congruent angles.
What is an angle bisector?
500
Two sides of a polygon that share a common vertex.
What are consecutive sides?
500
Two angles of a triangle that are opposite two sides of equal length.
What are base angles?
500
An equiangular rhombus or an equilateral rectangle.
What is a square?
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