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Know your shapes by sight and properties. Identify triangles, quadrilaterals and polygons using sides, angles and symmetry, then match names to features quickly for KS3 problems.
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Fascinating Fact:
An equilateral triangle has three equal sides, while an isosceles has two equal sides, and a scalene has none.
In KS3 Maths, shape identification means recognising polygons by their features: side lengths, angle sizes, and lines of symmetry. You’ll classify triangles and quadrilaterals, use angle facts, and match names to properties.
Key Terms
Polygon: A flat shape made of straight sides, e.g., triangle, quadrilateral, pentagon.
Regular polygon: A polygon with all sides and all angles equal, e.g., an equilateral triangle or a square.
Line of symmetry: A line that divides a shape into two matching halves that reflect each other.
Frequently Asked Questions (Click to see answers)
How do I tell triangle types apart?
Use sides and angles: equilateral (three equal sides, three 60° angles), isosceles (two equal sides, base angles equal), scalene (no equal sides), and right-angled (one 90° angle).
What is the difference between a square and a rectangle?
Both have four right angles. A rectangle has opposite sides equal; a square is a special rectangle with all four sides equal and four lines of symmetry.
How can I identify common quadrilaterals quickly?
Parallelogram: two pairs of parallel sides. Rhombus: all sides equal, opposite angles equal. Kite: two pairs of adjacent equal sides. Trapezium: at least one pair of parallel sides.