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並前往https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/v/acute-right-and-obtuse-angles

Acute, right, & obtuse angles (video) - Khan Academy

Acute angles measure less than 90 degrees. ... easy way to remember these acute a cute little angle right square in the middle and ... What is obtuse?

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