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Question: An online student studying STEM subjects is tasked with determining the ratio of the area of the incircle to the area of a right triangle with hypotenuse $ z $ and inradius $ c $. What is this ratio?
Solution: The area of the incircle is $ \pi c^2 $. For a right triangle, the semiperimeter $ s = \frac{a + b + z}{2} $, and the inradius $ c = \frac{a + b - z}{2} $. The area of the triangle is $ r \times s = c \times (z + c) $. Therefore, the ratio is $ \frac{\pi c^2}{c(z + c)} = \frac{\pi c}{z + c} $. The answer is $ \boxed{\dfrac{\pi c}{z + c}} $.
Question: A robotics researcher designs a circular obstacle avoidance path for a robot. If the robot's shortest detour forms a triangle with sides of 7 units, 24 units, and 25 units, what is the radius of the circumscribed circle around its path?
Solution: For a right triangle with legs 7 and 24, and hypotenuse 25, the hypotenuse is the diameter of the circumscribed circle. The radius $ r = \frac{25}{2} = 12.5 $ units. Thus, the radius is $ \boxed{12.5} $.
Question: A geographer uses GIS to analyze a rectangular region with a perimeter of 40 km and a length-to-width ratio of 3:2. What is the circumference of the circle that circumscribes this rectangle?
Solution: Let the length be $ 3x $ and width $ 2x $. The perimeter $ 2(3x + 2x) = 10x =
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