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Some practice classifying geometric shapes.
Watch and do these example exercises along with us. Remember what you have learned about perpendicular lines, right, obtuse, and acute triangles.
How about this: we are given a 4-sided shape and asked to determine whether its properties qualify it to be called a quadrilateral (or category of quadrilaterals). Check it out.
Classify shapes based on pictures or attributes, such as angle types and side-lengths.