LO: To find area of composite shapes.
Know:

the dimensions of 2D shapes such as length and width (height).

how to classify different 2D shapes by their properties.

what the formulas for calculating the area of different 2D shapes.
Understand:

That formulas can be used to quickly and efficiently find the area of composite shapes.

That composite shapes can be broken down to simple 2D shapes.
Do:

I can find the area of composite shapes.
Elaborations

understanding that partitioning composite shapes into rectangles and triangles is a strategy for solving problems involving area.