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Understanding Angles: Right, Acute, Obtuse, and Straight

This guide covers the essential types of angles: right, acute, obtuse, and straight. A right angle measures exactly 90 degrees, while an acute angle is less than 90 degrees. An obtuse angle ranges from greater than 90 degrees to less than 180 degrees, and a straight angle measures exactly 180 degrees. Additionally, it explains perpendicular lines—intersecting lines that form four right angles. This resource is perfect for students learning the fundamentals of geometry.

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Understanding Angles: Right, Acute, Obtuse, and Straight

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  1. Identifying Angles 10-2 326-327

  2. Right Angle • Measure is exactly 90 degrees A B C ABC = 90

  3. Acute Angle • An angle with a measurement of less than 90 degrees (Use the little numbers) D E F DEF 90

  4. Obtuse Angle • An angle that has a measure greater than 90 degrees but less than 180 degrees 90 GHI 180 G H I

  5. Straight Angle • An angle that has a measure of exactly 180 degrees JKL = 180 J K L

  6. Perpendicular Lines • Intersecting lines that form 4 right angles R RS and PQ are perpendicular lines The form the angles RTP RTQ QTS STP P Q T The symbol means “is perpendicular to”: RS PQ S

  7. 326-327 • 2-40 even

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