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ISEE Middle Level
Mathematics Achievement

Acute Angle Between Intersections of Lines

Hard Geometry Lines And Angles

In the coordinate plane, line $l_1$ passes through the points (2, 3) and (4, 7). Line $l_2$ has a slope of 2 and intersects line $l_1$ at point P.

What is the measure of the acute angle formed by lines $l_1$ and $l_2$ at point P?

Hint

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