Mathematics Stack Exchange
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Questions tagged [congruences-geometry]

For questions about congruent geometric figures, e.g., determining whether one figure is congruent to another.

Two geometric figures are called congruent if they have the same shape and size.

More formally, two sets of points are called congruent if they are equal up to an isometry.

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(Confusing) Sine/Cosine rule for Question Regarding Obtuse Triangle / GCSE

Background: This question was taken from Pearson's Edexcel GCSE (9-1) Mathematics Algebra and Shape Workbook Question focus: 3(a) Triangle WXZ - Diagram (link to image, provided by stack exchange) According to the question (a), I am being told to…
Ethan Z.
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Proving two triangles are congruent

The two circles shown are identical and pass through each other's centre. The line $AC$ passes through the centres of both circles. I would like to prove that triangles $ABD$ and $BCE$ are congruent (I think they are?) I want the shortest possible…
PhysicsMathsLove
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