Investigating Circle Theorems

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Hi Sarah. Could you please help me solve this question please. A small carpark has a drain at its centre for rainfall. The carpark measures 18m × 60m. During a storm, 10 cm of rain falls in 1 hour. Find how many litres of rain per second must pass through the drain to prevent flooding. Question 5. Section 17.3. Text and tests 2 higher level. Thank you so much for your help and support. You are a star. Yousef

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Hi again Sarah. I need your help again please. I'm stuck on question number 17 (exercise 17.1).junior cycle maths text and tests Higher level. The question reads a semicircular shape of radius 9 cm is cut from a solid cube of side 18cm.
I managed to answer section i . I'm only struggling with section ii the surface area of the remaining solid please . Could you help me please. Thanks yousef

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