The bridge arc has a span of 72 m and height 5 m. Calculate the radius of the circle arc of this bridge.

Correct answer:

r =  132.1 m

Step-by-step explanation:

r2=(72/2)2+(r5)2 r2=722/4+r225r+52 25r=722/4+52 r=85722+25=132.1 m  a=36 b=r5=127.1 c=r=132.1 m

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