exam Maths Puzzle Numerical Ability

How does the solution set for a linear equality differ from a linear inequality over a given region of 2-dimensional space?

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The question is how wide must a clearing be in front of a house in order to see the lake over the trees.

N.B. In order to understand the diagram, you must change this to a mono-
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1. (4 pts) ÐDEF and ÐGHI are complementary angles and ÐGHI is eight times as large as ÐDEF. Determine the measure of each angle.