In a three-hinged arch, to find the support reactions at points A and B, points B and C are connected and extended to meet the load line at point D. Additionally, a line parallel to the load line is drawn through point A, intersecting at D'. Given the distances AD = 4 cm, DD' = 3 cm, and AD' = 5 cm, what is the angle between the reaction forces at supports A and B?

Theory of Structures MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Theory of Structurescivil-engineering-mcqs › theory-of-structures
Published
17 Jan 2019
Last updated
28 May 2026

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Explanation

Using the given distances, the triangle formed by points A, D, and D' is a right triangle since AD² + DD'² = AD'² (4² + 3² = 5²). This implies the angle between the reactions at A and B is 90 degrees.

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