Geometry is the most common of all math courses: over four-fifths complete it in high school. Yet the subject, featuring countless proofs of triangles’ congruence, is notoriously irrelevant. Geometry rarely pops up after the final exam, even in other math classes. Algebra I, which teaches students graphing and one- and two-variable equations, has many practical applications. Most students, however, continue on to Algebra II, which largely exists to prepare students for calculus.6 Calculus, in turn, gets you into college. Once college begins, however, you’ll probably never differentiate another
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