The cross-section of a tunnel is a circular arc. The maximum height of the tunnel is 10 (units). A vertical strut 9 (units) high supports the roof of the tunnel from a point 27 (units) along the ground from the side. Calculate the width of the tunnel at ground level.(adsbygoogle = window.adsbygoogle || []).push({});

Please help me solve this.

P.S:-I'd post this in HW help, but this isn't my home work, its just a sum thats bugging me.

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# Circular arc

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