Attributes of 2D Polygons

These closed shapes are all called polygons.

• True

• False

The corners where two sides meet are called _____________

• lines

• angels

• vertices

• point

• square

• right angle

• corner

• rectangle

Which triangle is a RIGHT TRIANGLE?

• pink

• blue

• yellow

Answer explanation

A right angle has one 90° angle

Which triangle is an OBTUSE TRIANGLE?

• pink

• blue

• yellow

Answer explanation

An obtuse triangle has one angle that is greater (bigger) than 90°.

Which triangle is an ACUTE TRIANGLE?

• pink

• blue

• yellow

Answer explanation

An actue triangle has three angles that is less (smaller) than 90°.

These shapes are all quadrilaterals because __________.

• they have lines.

• they have 4 sides and 4 vertices.

• they are polygons.

Trapezoids are quadrilaterals with exactly one pair of parallel sides.

Which picture is a trapezoid?

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Rectangles are quadrilaterals with four 90° right angles.

Which two pictures are quadrilaterals?

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• 
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Squares are quadrilaterals with four equal sides.

Which picture is a square?

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