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Grade 7 Maths: Triangles and quadrilaterals poster

A one-page CAPS Grade 7 Maths poster on triangles and quadrilaterals (Shapes and space), with the key ideas, key words and a tip to remember.

CAPS Grade 7MathsShapes and spaceFree
Maths · Grade 7 · Shapes and space
Triangles and quadrilaterals

1Types of triangles

  • Equilateral: three equal sides.
  • Isosceles: two equal sides.
  • Scalene: no sides are equal.
  • Right-angled: one angle is 90°.

2Angles of a triangle

The three angles of any triangle add up to 180°. Subtract the angles you know from 180°.

Example

Angles 72° and 38°
72° + 38° = 110°
Third angle: 180° − 110° = 70°

3Special quadrilaterals

  • Square: four equal sides, four right angles.
  • Rectangle: four right angles, opposite sides equal.
  • Rhombus: four equal sides.
  • Parallelogram: opposite sides parallel.
  • Trapezium: one pair of parallel sides.
  • Kite: two pairs of equal sides next to each other.

4Angles of a quadrilateral

The four angles of any quadrilateral add up to 360°.

Example

Angles 100°, 85° and 90°
100° + 85° + 90° = 275°
Fourth angle: 360° − 275° = 85°

5Equal angles

  • Isosceles triangle: the angles opposite the equal sides are equal.
  • Parallelogram: opposite angles are equal.
  • Kite: one pair of opposite angles is equal.
Example

A parallelogram has an angle of 70°.
The opposite angle is 70°.
The other two: (360° − 140°) ÷ 2 = 110° each

Key words

equilateral
three equal sides
isosceles
two equal sides
scalene
no equal sides
parallel
always the same distance apart
quadrilateral
a shape with four sides
Remarkable · remarkablereports.com

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