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Missing trapezoid measure from area: Larger base Calculator

Missing trapezoid measure from area: Calculate larger base from Area, Smaller base, Height. Check the formula, input units and worked result on this page.

Enter your values

cm²
Formula symbol: A. Required unit: cm². Must be greater than zero.
cm
Formula symbol: b. Required unit: cm. Must be greater than zero.
cm
Formula symbol: h. Required unit: cm. Must be greater than zero.

Use a decimal point, without thousands separators.

Lengths use cm, areas cm² and volumes cm³ on one consistent scale. The positive real branch is selected; the supplied quantities must describe the stated shape.
Example result
Larger base
10 cm

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

The two bases are parallel and height is perpendicular to them. The midsegment is the arithmetic mean of the bases. This form solves for larger base; enter the known quantities in Area, Smaller base, Height.

Inputs and units
Missing trapezoid measure from area: Larger base Calculator · Inputs and units
InputExample valueWhat to enter
Area32 cm²Formula symbol: A. Required unit: cm². Must be greater than zero.
Smaller base6 cmFormula symbol: b. Required unit: cm. Must be greater than zero.
Height4 cmFormula symbol: h. Required unit: cm. Must be greater than zero.
B = 2A/h − b

Worked example

Show example inputs and results

This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.

Area
32 cm²
Smaller base
6 cm
Height
4 cm

Complete example results

Larger base
10 cm

Reading the result

The result solves for larger base from the entered quantities. Check the result unit and the formula conditions before using it.

Questions and answers

Can I use the example values for my own calculation?

The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.

When can I use the larger base result?

Lengths use cm, areas cm² and volumes cm³ on one consistent scale. The positive real branch is selected; the supplied quantities must describe the stated shape.

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method sources: openstax.org

Methods & accuracy

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