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You cannot have a trapezoid with three sides!

Or if the question was something like 'You know three of the four sides of a trapezoid' ; that cannot be done either, because there is no way of calculating what the length of the fourth side is.

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Q: How do you calculate the perimeter of a trapezoid with three sides?
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Related questions

How many sides do you need to know to calculate the area of a trapezoid?

To calculate the area of a trapezoid, you have to know the lengths of three sides because 1/2*(sum of parallel sides)*perpendicular height = area


How do you calculate a parimeter?

That would be "perimeter". The perimeter is the distance around a figure, and it is calculated by adding the lengths of the different sides. For example, for a triangle, add the lengths of the three sides.


Does a trapezoid has three congruent sides?

No it does not


How do you calculate perimeter of a triangle?

-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle. ----------------------------------- The perimeter is the sum of all three sides. Sometimes it is unnecessary to compute each side length; all we care about is the sum.


Has a trapezoid have three congruent sides?

Not usually.


What is a quadrilateral with three equal sides?

A trapezoid.


How do you work out circumference of a triangle?

You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.You add the three sides. This "circumference" is usually called perimeter, by the way.


What is the perimeter of triangle?

The perimeter of a triangle is the sum of its three sides.


How long are the sides of an equilateral triangle if the perimeter is 25.2 inches?

An equilateral triangle is going to have three equal sides. The perimeter is the sum of all three sides. To find the answer, divide the Perimeter (25.2 in.) by 3 (three sides) 25.2 in. / 3 = 8.4 in.


How do you find the perimeter of a triangle?

you add up the measures of the sides Perimeter=a+b+cAdd up the three sides together


Can a trapezoid make a triangle?

No because a trapezoid has 4 sides and a triangle has three if a trapezoid had three then it would be a triangle. If you had 3 trapezoids you could make a triangle!


How do you find the perimeter of a triangle when all three sides are given?

If you have the length of each of the three sides of a triangle, you can find the perimeter of (the distance around) the triangle by adding the length of the sides. Their sum will be the perimeter of this geometric shape.