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2020 AMC 12B/7 moment

Source: 2023 AMC 12A #11

November 9, 2023
AMCAMC 12AMC 12 Aanalytic geometrygraphing lines2023 AMC2023 AMC 12A

Problem Statement

What is the degree measure of the acute angle formed by lines with slopes 22 and 13\tfrac{1}{3}?
<spanclass=′latex−bold′>(A)</span> 30<spanclass=′latex−bold′>(B)</span> 37.5<spanclass=′latex−bold′>(C)</span> 45<spanclass=′latex−bold′>(D)</span> 52.5<spanclass=′latex−bold′>(E)</span> 60<span class='latex-bold'>(A)</span>~30\qquad<span class='latex-bold'>(B)</span>~37.5\qquad<span class='latex-bold'>(C)</span>~45\qquad<span class='latex-bold'>(D)</span>~52.5\qquad<span class='latex-bold'>(E)</span>~60
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