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Year 4 · Shapes & Geometry

Types of triangles

Triangles are named by their sides and angles: equilateral (3 equal), isosceles (2 equal), scalene (none equal), right-angled (a 90° corner).

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How to do it

  1. Look for equal-side marks.
  2. Look for a square corner.

Worked example

Two sides marked equal
Two equal sides
Isosceles

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A triangle can be both isosceles and right-angled.

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