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OpenStudy (anonymous):
a figure shows two equilateral triangles that share one side (20 cm) What is the perimeter of the quadrilateral?
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OpenStudy (anonymous):
equilateral triangles all have same sides. So that means 2 of the sides of the quadrilateral must be 20cm, per triangle. Therefore the perimeter would be the addition of the exposed sides. There are 4 @ 20cm each. 4x20=80cm
OpenStudy (anonymous):
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