At = 1/2bh
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You get the area by using formulas. There is usually a specific formula to find the area of each shape. Some irregular shaps may not have a formula.
The formula will depend on what it is that you are trying to find: the volume or the surface area.
The formula to find the area of an octagonal pyramid is area of base plus area of sides.
The formula for the area of a parallelogram: Base times Height (BH)
1/2(bh)