A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus.
Here is how they relate to each other:
We have been looking at triangles based on their angles.
The right triangle has one 90 degree angle and two acute (< 90 degree) angles.
Obtuse triangles have one angle that is greater than 90 degrees. Obtuse triangles have only one obtuse angle.
Acute triangles have NO angles greater than or equal to 90 degrees -- all their angles are less than 90 degrees. Acute triangles have three acute angles.
Ask your kiddo if they can find these different quadrilaterals and triangles in the world around them.
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