The interior angle of a regular polygon is 20 more than three times the

# The interior angle of a regular polygon is 20 more

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14. The interior angle of a regular polygon is 20 0 more than three times the exterior angle. Find the number of sides of the polygon. (4 marks) 6

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SECTION 2 (5 MARKS) 15. A hemispherical bowl has internal and external radii 30cm and 32cm respectively. a) Calculate the volume of material used in making the bowl.(4 marks)b) The bowl is made of copper of density 9g/cm3. Calculate the mass of the copper used to make the bowl with an additional 25% for making the handles.(4 marks)c) Find the total cost of making the bowl if copper costs shs.450 per kg.(2 marks) 7
16. 3 taps x, y and z can fill a tank in 40 hours, 15 hours and 20 hours respectively. The three taps are turned on at 8.00 am, when the tank is empty, for five hours then z is turned off. After 2 hours, tap y is turned off. Work out: 8

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• Fall '18
• ANYANZWA

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