Take its length and multiply by its width.
For example:-
Length-30cm,Width-19cm
Area=length x width
=30x19(cm)
=570 units2.
Answer=The area of the rectangle is 570 units2.
Note:
Make sure to use the same units for length and width. The result is measured in units².
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the area of a triangle is base times height times one half and rectangle is length times width
Squares are rectangles so the formula for area will stay the same.
Knowing the length and the width.
in finding the area if a square or rectangle multiply the length and width, for a triangle, multiply length and width divided by two.
It is base times perpendicular height.