How many pairs of vertical angles are formed by five distinct lines that have a common point of intersection?
How many pairs of vertical angles are formed by five distinct lines that have a common point of intersection?
No need for mathematical formulae here. Just draw it and count them. FIVE
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There's a better way than drawing and counting, I can't keep track of it all.
But I noticed that for every 2 lines, they add 6 new angles.