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A(2)+B(2)=C(2) = the rule of 45's, just simplified.

The rule of 45's can be used, it's not the most accurate. Take a broom handle in your hand, put the tip against your shoulder then let it go upright. Walk backwards until the top of the tree is the same height as the top of the broom handle. Make a mark on the ground and measure it, or, there...