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Find Missing Side of Trapezoid Calculator Online

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This calculator is design to compute the unknown side of a trapezoid when you know certain dimensions—such as the area, one base, and the height. This tool not only enhances learning in educational settings but also supports professionals in fields requiring geometric calculations.

Formula

To determine the missing side of a trapezoid, we use a simple formula derived from the area calculation of the shape:

Missing Side of Trapezoid

Where:

  • Area is the area of the trapezoid.
  • a and b are the lengths of the parallel sides (bases).
  • h is the height.
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Given the area, height, and one base, you can find the other base using these steps:

  1. Multiply the area by 2 to remove the fraction: 2 * Area = (a + b) * h
  2. Divide the result by the height to isolate the sum of the bases: (a + b) = (2 * Area) / h
  3. Subtract the known base from this result to find the missing base: b = (2 * Area) / h – a

These steps provide the length of the missing base quickly and efficiently.

Table of General Terms

TermDefinitionRelated Calculations
BaseLength of the parallel sides of a trapezoid.Calculation of area, perimeter.
HeightVertical distance between the bases.Used in area calculation.
AreaSpace enclosed by the trapezoid.Base and height are needed for calculation.

This table serves as a quick reference for common trapezoidal calculations, facilitating easier use of the calculator.

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Example

Consider a trapezoid where the area is 50 square units, one base (a) is 8 units, and the height (h) is 5 units. To find the missing base (b), apply the formula:

  1. 2 * Area = 100
  2. (a + b) = 100 / 5 = 20
  3. b = 20 – 8 = 12 units

The missing base of the trapezoid is 12 units.

Most Common FAQs

Q1: Can the calculator determine the height if the bases and area are known?

A1: Yes, rearranging the formula allows you to calculate the height if the area and both bases are known.

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