standard_description: Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.
problem_activity: Task
For each pair of figures, decide whether these figures are the same size and same shape. Explain your reasoning.
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What does it mean for two figures to be the same size and same shape?


aligns: no