shows a rectangle subdivided into four triangles. Jonathan says that because the angles in each of the four triangles add to 180°, the angles in the rectangle add to 180°+180°+180°+180°=720°180°+180°+180°+180°=720° but Ben says that the angles in a rectangle add to 90°+90°+90°+90°=360°90°+90°+90°+90°=360° Discuss the boys’ ideas.

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