Angles
Show a right angle with your hands or on a whiteboard
Right Angle
Triangle that has one right angle
right triangle
What does quadrilateral mean?
four sides
Draw a line.
straight line with arrows at both ends
Show an acute angle on your whiteboard or with your hands.
Acute Angle
Triangle that has all acute angles
acute triangle
Quadrilateral that has four equal sides, and four right angles
Square
Draw a ray.
Straight line with a dot at one end and an arrow at the other end.
Is an acute angle bigger or smaller than a right angle?
smaller than a right angle
Triangle that has one obtuse angle.
Obtuse triangle
Quadrilateral that has opposite sides equal length and has all right angles
rectangle
Draw a line segment.
Straight line with a dot at both ends.
Show an obtuse angle with your hands or on a whiteboard.
Obtuse angle
Triangle that has all angles smaller than a right angle.
Acute Triangle
Quadrilateral that has opposite sides that are parallel.
parallelogram
Draw a right triangle.
Right triangle.
An obtuse angle is ________ than a _______ angle.
bigger than a right angle
How many obtuse angles are in an obtuse triangle
There can only be one obtuse angle in a triangle.
Quadrilateral that has one pair of parallel sides.
trapezoid
Draw a quadrilateral.
Any four sided closed figure.