exam Maths Puzzle Numerical Ability

10/21=5/16a

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how would you prove that triangle bca ia a right angled triangle?? co-ordinates on plane are: a(-4,3) b(2,-4) c(0,4) I need to know what 3 dimensional solid has a vertical cross section that is a retangel and a horizontal crosssection that is a circle. I need the name and picture. Thank you for your help