Each unit on the grid stands for one mile. Determine two ways to calculate the distance from Josie's house to Annie's house.
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watchmath · Answer

From Josie's house to Annie's house we go 3 units across and 4 units down. So the distance between the two houses is the hypothenuse of a right triangle with 4 and 3 sides. By Pythagorean's formula the hypothenuse is $\sqrt{4^2+3^2}=5$ miles.