Perimeter and area Perimeter and area. The perimeter and area of triangles, quadrilaterals (rectangle, parallelogram, rhombus, kite and square), circles, arcs, sectors and composite shapes can all ...

Extra: The puzzle presented in this activity is called a “perimeter magic triangle of order three.” To extend it to a higher-order perimeter magic triangle start by drawing a new triangle.

The perimeter and area of triangles, quadrilaterals (rectangle, parallelogram, rhombus, kite and square), circles, arcs, sectors and composite shapes can all be calculated using relevant formulae.

To calculate the area of a triangle in Excel, you need to use this formula =(<cell with length>*<cell with height>)/2. If the length is given in the A1 cell and height in the B1 cell, you need to ...