IXL | Identify rectangles | 5th grade math

How many right angles does this quadrilateral have?

right angles

Is the quadrilateral a rectangle?

yes

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Learn with an example

How many right angles does this quadrilateral have?

right angles

Is the quadrilateral a rectangle?

yes

A right angle looks like the corner of a square. An acute angle is less than a right angle. An obtuse angle is greater than a right angle.

Acute angle

Right angle

Obtuse angle

Right angles are usually marked with a special symbol. This symbol looks like a small square placed in the angle.

A quadrilateral is a shape with four sides. A rectangle is a quadrilateral with four right angles.

Look at each angle in the quadrilateral. To see which are right angles, imagine placing a small square in each one.

One angle is marked with a right angle symbol. That means it is a right angle, and a square fits in it perfectly.

These angles have more than enough room to fit the squares.

So, these angles are obtuse.

This angle does not have enough room to fit a square.

So, this angle is acute.

This quadrilateral only has 1 right

angle.

So, it is not a

rectangle.

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