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Mathematics 12 Online
OpenStudy (anonymous):

The cross-section of a tunnel is a rectangle of height h surmounted by a semicircular roof section of radius r. (figure posted below). The cross-sectional area is A ft^2. What is the perimeter in terms of r and A only?

OpenStudy (anonymous):

|dw:1332995647339:dw| Sorry for the artistic abilities :P

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