You calcualte the area of a rectangle by multiplication as this finds the interior or area inside the rectangle. Calculating perimeter consists of adding the four lengths of the rectangle to find the border length.
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If those are the dimensions of a rectangle, simply multiply length times width.
The perimeter of rectangle A would then be 80 because 80 to 100 is 4 to 5 simplified and the area of triangle A would depend on the sides and area of rectangle B which have not been given.
Opposite sides are equal in length and opposite angles are equal in measure. To find the area of a parallelogram, multiply the base by the height. The formula is: A = B * H where B is the base, H is the height, and * means multiply.
A = bh (multiply length x width).
The surface area is L*B where L is the length of the rectangle and B is the breadth.