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Civil Engineering Question

Civil Engineering Question

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Step 1: diagram

Civil Engineering homework question answer, step 1, image 1

As we know, two sides of triangle and angle between them , by applying cosine rule ,third side can be found out. 

Step 2: Cosine rule

c2= a2+ b2-2ab cos(θ)where,c= side to be found out= length of tunnela = b =known sides of triangleθ = Angle opposite to length of tunnelputting values in above equation,c2 =3002+2002-2×300×200 cos(80)c2 = 109162.22c=  109162.22c = 330.4 ft

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