exam Maths Puzzle Numerical Ability

the square root of 80m^2

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exam Other Question

Town A is 5 miles east and 7miles south of town B how far apart are the two towns? I need Theorem 3-10 to be proof.

The Theorem states the "Two lines parallel to a third line are parallel to each other."
Given: k || l; k || n
Prove: l || n