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(3) "Right-angled triangle"

Author: rindenExecutions: 323
TOP/Shared Formulas (Math)/Geometry

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For the elementary geometry problem “Right-Angled Triangle,” please search Google for “Biglobe Langley’s Problem” and refer to “Math and Gauss” on the top page. (I changed my internet service provider in 2026.)
Given point D inside triangle ABC, and knowing the measures of ∠ABD, ∠DBC, ∠DCB, and ∠ACD, find the measure of ∠DAC.The numbers (10, 30, 70, 40) below will disappear when you click “Clear.” Enter the angles you want to calculate and click “Calculate.”
∠ABD
degrees
∠DBC
degrees
∠DCB
degrees
∠ACD
degrees
∠DAC＝ degrees
When ∠DAC = x < 0, ∠ADB is an obtuse angle, so please consider ∠ADB = 180° + x. Since we are using ARCTAN, it follows that -90° < ARCTAN < 90°.

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