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Geometry & measuresCommon

Angles in isosceles triangles

Tick marks show the equal sides. Top angle given first with a frame, then a base angle given, then answers with a reason.

A free GCSE Foundation and Higher geometry and measures lesson on angles in isosceles triangles, spec code G6. It has a lesson deck to teach from with a visualiser, a worksheet with answers, a puzzle, an exit ticket and an end of unit test.

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