The perimeter of the trapezoid in the diagram is 25 cm. Calculate the missing side.
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The perimeter of the trapezoid in the diagram is 25 cm. Calculate the missing side.
We replace the data in the formula to find the perimeter:
cm
Calculate the perimeter of the trapezoid according to the following data:
Perimeter is the total distance around the outside of a shape. For any polygon, add up all the side lengths. In this trapezoid, we add all four sides together.
First, add up all the known sides: 4 + 7 + 11 = 22 cm. Then set up: , where 25 is the total perimeter and x is the unknown side.
Check your work! Side lengths must be positive. A negative result usually means you made an error in addition or subtraction. Re-add the known sides carefully.
No! For perimeter problems, it doesn't matter if it's a trapezoid, rectangle, or any other quadrilateral. You simply add all the sides regardless of the shape.
Your missing side should be a reasonable positive number. Also, substitute back: if x = 3, then 4 + 7 + 11 + 3 should equal 25. Always verify!
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