The answer depends on what information about the rectangle you do have.
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If the figure is a rectangle, the area is 60. If the figure is a triangle, the area is 30.
If the figure is a rectangle, the area is 60. If the figure is a triangle, the area is 30.
They are both polygon. If you cut a rectangle diagonally, you will have two triangles. And if you want to figure out the area of a right triangle, you can treat it as a rectangle and then cut your calculation in half to get the correct answer.
The area of a figure is the amount of two dimensional space occupied within its boundaries. For regular polygons there are set formulas, for example, the area of a rectangle is equal to length times width.
Suppose you are asked to find the area of a rectangle that is 2.1- wide by 5.6- long. Your calculator answer would be 11.76 . Now suppose you are asked to enter the answer to two significant figures.