exam Maths Puzzle Numerical Ability

Please help! Can you explain to me or show me how to do the following problem :

Draw and label :

Line L and M in plane ABC intersect at point C

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exam Other Question

quadratic equations-word problem
Chris cuts half a rectangular lawn, 40m by 30m, by mowing strips around the perimeter. Jerri cuts the small rectangle left. How wide a strip does Chris cut so that they share the work equally? A cylinder must be constructed so that it holds 2000 ft cubed. Find the Circumference of the cylinder if the height is 16 feet