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How to do the math problem of area?
First, determine the area of what figure is needed, then determine the relationship, and find the corresponding quantity (pay attention to the same unit) before calculation.

Rectangular area = length times width

Square area = side length multiplied by side length

Triangular region

= base times height divided by 2.

parallelogram

Area = bottom times height

The area of a circle = π times the square of R.