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For a square, rectangle, and parallelograms. The Formula is Base x Height( or Length x Width).

With Circle it is Pi x Radius Squared

With multiple unfamiliar shapes like a square with a missing corner. You have to split it into multiple formulas in Parentheses multiplying each one according to PEMDAS and then add all of the multiplied formulas them for your area.

For Triangle it is Base x Height divided by 2( or times 1/2) because 2 triangles can make a square or rectangle. For height find the Right angle because usually your teacher puts a dotted line of the right angle. Don't matter the diagonals.

For trapezoid is tricky. You do (B1(short line) + B2(Longer line) x Height divided by 2. Or remove divided by 2 and multiply by 1/2 because they are the same thing.

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