IXL | Sides and angles in polygons

Which polygon appears to have at least 2 pairs of perpendicular sides?

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Which polygon appears to have at least 2 acute angles?

A right angle measures exactly

Right angles look like the corners of a square.

An acute angle measures between

and

Acute angles are smaller than a right angle.

An obtuse angle measures between

and

180

Obtuse angles are larger than a right angle.

Find the polygon with at least 2 acute

angles.

red X symbol, There are no angles in this hexagon smaller than a right angle. So, this hexagon has no acute angles.

red X symbol, The angle at vertex 4 is smaller than a right angle. So, this trapezoid has 1 acute angle.

red X symbol, There are no angles in this pentagon smaller than a right angle. So, this pentagon has no acute angles.

green checkmark, The angles at vertex 1 and vertex 3 are each smaller than a right angle. So, this triangle has 2 acute angles.

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