(2) "The Langley Type B Problem"
Author: rindenExecutions: 56
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"The Langley Type B Problem." For more information on this, please search Google for "Biglobe Langley problem" and refer to the "Math and Gauss" section on the top page. (I switched internet service providers in 2026.)
This is a calculation site for finding ∠ACB in quadrilateral ABCD when the four angles ∠ABD, ∠DBC, ∠BDC, and ∠ADB are known. For “Langley Type B problems,” the way the angles are given differs slightly from “Langley problems.”First, click “Clear” to remove the default values (30, 20, 40, 30) below, then enter the four angles and click “Calculate.”
| ∠ACB = | degrees |
Since the angle is calculated using the arctangent function, if the output shows ∠ACB < 0, this indicates an obtuse angle; please recalculate ∠ACB + 180° and use that value as ∠ACB.
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