the formula for the area of a square or rectangle is length times height
the formula for the area of a circle is pi times radius squared
the formula for the area of a triangle is half base times height
the formula for the area of a trapezoid is 1/2(top + bottom) times height
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The area formula for the parallelogram is related to the area formula for a rectangle because you can make the parallelogram into a rectangle to find the area.
Area of what? Every geometrical shape has a different formula to find its area. The simplest one: to find the area of a rectangle whose edge lengths are h and w, area = h*w.
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 depends on the information available to you.
The formula to find the surface area of a parallelogram is Base*Height.