Select the shapes that possess 1 pair of parallel sides.

Select the shapes with 2 pairs of parallel sides.

Which of these angles are right angles (in other words, 90 degree angles)?

Which of these angles are acute angles (in other words, angles that are less than 90 degrees)?

Which of these angles are obtuse angles (in other words, angles that are larger than 90 degrees)?

Which of these shapes has 1 right angle?

Acute angles are less than 90 degrees.

Select all of the angles in this rhombus that are acute.

Obtuse angles are greater than 90 degrees.

Select all of the angles in this rhombus that are obtuse.

Quadrilaterals have 4 straight sides. Rectangles are quadrilaterals, and rectangles have four 90 degree angles.

Select the quadrilaterals that are rectangles.

Rectangles have 4 right angles. Squares have 4 right angles, and their sides are all the same length.

Select the quadrilaterals that are squares.

Perpendicular means that a pair of lines or sides are oriented at 90 degrees to one another.

Select the shapes that contain perpendicular sides.

A parallelogram is a 4-sided shape that has 2 pairs of parallel sides.

Select the shapes that are parallelograms.

A parallelogram is a 4-sided shape with 2 pairs of parallel sides. A rhombus is a parallelogram whose sides are all the same length.

Select the images of rhombuses.

A parallelogram is a 4-sided shape with 2 pairs of parallel sides. A rhombus is a parallelogram whose sides are all the same length.

True or false: a square is a rhombus.

A trapezoid is a quadrilateral with only 1 pair of parallel sides.

Select the shapes that are trapezoids.

A line of symmetry is an imaginary line that passes through the center of the shape and divides it into identical halves (like a mirror).

Select the shapes that contain a line of symmetry.

A line of symmetry is an imaginary line that passes through the center of the shape and divides it into identical halves (like a mirror). Symmetrical shapes contain a line of symmetry.

Select the symmetrical shapes.