# 2D shapes

- Quadrilaterals
- Parallelograms
- The rectangle
- The square
- The rhombus
- Parallelogram problem
- Closed shapes

Sponsored Links

- Regular polygons
- Irregular polygons
- Concave polygons
- Convex polygons
- Deriving the formula for the sum of the angles inside a polygon
- Tessellations

- Length of an arc
- Typical perimeter question
- The running track perimeter question
- Backwards perimeter question

- Converting between different units of area
- Imperial measurements of area

- Area of a triangle
- Area of a parallelogram
- Area of a trapezium
- Area of a circle
- Area of a sector
- Things to watch out for
- Tied up dog question