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

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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

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.

Not usually.

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.

Both a triangle and a trapezoid are polygons with straight sides. However, a triangle has three sides and three angles, while a trapezoid has four sides and four angles. Additionally, both shapes have interior angles that add up to 180 degrees.

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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

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.

No it does not

-- 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.

Not usually.

A trapezoid.

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.

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

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.

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

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!

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.