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    Acute Angle

    Illustration

    Basic definition

    An acute angle is an angle that measures less than 90 degrees.

    Detailed definition

    An angle of less than π/2 radians (90°) is called an acute angle.

    Related terms

    acute triangle | angle | full angle | obtuse angle | reflex angle | right angle | straight angle

    Educational grade level

    elementary school level (California grade 4 standard)

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