Online worksheet ยท 4 of 4
Properties constrain the possibilities - Online practice 4
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Triangle ABC has AB = AC and vertex angle BAC = 80 degrees. Its two base angles are equal. Separately, a convex quadrilateral has three interior angles 90, 100 and 80 degrees. Triangles total 180 degrees; quadrilaterals total 360 degrees. Side equality alone does not guarantee right angles.
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