GEOMETRY QUICK GUIDE 2 - 2D SHAPES (UK)

Oct 22, 2026

Uploaded by Aditya

Concise reference for learning 2D shapes in UK geometry. Summarizes key properties of triangles (equilateral, isosceles, scalene, right, acute, obtuse), quadrilaterals (square, rectangle, rhombus, parallelogram, kite, trapezium), and trapezoids where applicable. Also lists regular polygons with their number of sides and interior angles: equilateral triangle, regular pentagon, hexagon, octagon, and decagon, supporting quick revision and identification.

LanguageEnglish

CategoryExam

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Triangles

Quadrilaterals

Regular polygons

Name Date GEOMETRY QUICK GUIDE 2: 2D SHAPES (UK) | TRIANGLES | QUADRILATERALS | | REGULAR POLYGONS | | --- | --- | --- | --- | |
= |
| | | | Equilateral triangle
All sides equal; interior angles 60° | Square
All sides equal; all angles 90° | | Equilateral triangle
3 sides; angle 60° | |
|
| | | | Isosceles triangle
2 sides equal; 2 congruent angles | Rectangle
Opposite sides equal, all angles 90° | | Square
4 sides; angle 90° | | |
| | | | Scalene triangle
No sides or angles equal | Rhombus
All sides equal; 2 pairs of parallel lines; opposite angles equal | | Regular Pentagon
5 sides; angle 108° | | |
| | | | Right triangle
1 right angle | Parallelogram
Opposite sides equal, 2 pairs of parallel lines | | Regular Hexagon
6 sides; angle 120° | | | | | | | Acute triangle
All angles acute | Kite
Adjacent sides equal; 2 congruent angles | | Regular Octagon
8 sides; angle 135° | |
| | | | | Obtuse triangle
1 obtuse angle | Trapezium
1 pair of parallel sides | Trapezoid
No pairs of parallel sides | Regular Decagon
10 sides; angle 144° | Name Date GEOMETRY QUICK GUIDE 2: 2D SHAPES (UK) | TRIANGLES | QUADRILATERALS | | | REGULAR POLYGONS | | --- | --- | --- | --- | --- | |
= | | | | | | Equilateral triangle
All sides equal; interior angles 60° | Square
All sides equal; all angles 90° | | | Equilateral triangle
3 sides; angle 60° | | | | | | | | Isosceles triangle
2 sides equal; 2 congruent angles | Rectangle
Opposite sides equal, all angles 90° | | | Square
4 sides; angle 90° | | |
- - | | | | | Scalene triangle
No sides or angles equal | Rhombus
All sides equal; 2 pairs of parallel lines; opposite angles equal | | | Regular Pentagon
5 sides; angle 108° | |
| | | | | | Right triangle
1 right angle | Parallelogram
Opposite sides equal, 2 pairs of parallel lines | | | Regular Hexagon
6 sides; angle 120° | | | | | | | | Acute triangle
All angles acute | Kite
Adjacent sides equal; 2 congruent angles | | | Regular Octagon
8 sides; angle 135° | |
| | | | | | Obtuse triangle
1 obtuse angle | Trapezium
1 pair of parallel sides | | Trapezoid
No pairs of parallel sides | Regular Decagon
10 sides; angle 144° |

FAQs

What information does the quick guide provide for triangles?

It lists common triangle types and gives defining properties such as equal sides, equal angles, and angle types (right, acute, obtuse).

How are quadrilaterals described in the guide?

Each quadrilateral type includes short rules about side equality and parallel sides, covering square, rectangle, rhombus, parallelogram, kite, and trapezium, plus trapezoid where shown.

Which regular polygons are included and what additional detail is given?

The guide includes the regular triangle, pentagon, hexagon, octagon, and decagon, along with the number of sides and interior angles.

Oct 22, 2026

Uploaded by Aditya