To determine if the shape Sam made is a rectangle without measuring any angles, he can look for the following properties of rectangles:
1. Equal opposite sides: A rectangle has two pairs of opposite sides that are equal in length. Sam can measure the lengths of the opposite sides and check if they are equal.
2. Parallel opposite sides: A rectangle has opposite sides that are parallel to each other. Sam can use a ruler or straight edge to check if the opposite sides he made are parallel.
If Sam finds that both the opposite sides are equal in length and parallel to each other, then the shape he made is a rectangle.
Sam has an assignment for school where he has to make a rectangular picture frame. But he can't measure any of the angles. What can he do to determine that the shape he made is actually a rectangle? (Hint: what properties of rectangles don't involve angles
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