AQA GCSE Mathematics · 8300
Specification G4 · Paper 1, Paper 2, Paper 3
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GCSE Mathematics · key term
A triangle with at least two equal sides; the angles opposite those sides are equal.
Used by AQA, Edexcel and OCR
Specification G4 · Paper 1, Paper 2, Paper 3
Specification G4 · Paper 1, Paper 2, Paper 3
A triangle with at least two equal sides.
Revise: Quadrilaterals and TrianglesAn isosceles triangle has at least two equal sides; its two base angles, opposite those equal sides, are equal. Imagine folding the triangle along the line from the meeting point of the equal sides to the middle of the base: the two halves match, which explains the equal angles.
Specification 8.01c, 8.04a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A triangle with at least two equal sides.
A triangle with two equal sides; the angles opposite those sides are equal.
Give a reason for each step of a proof, such as ‘base angles in an isosceles triangle are equal’ or ‘angles in a triangle sum to 180°’.
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