Mastering Euclidean Geometry

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Questions and Answers

Define a right angle.

A right angle is an angle that measures 90°.

Define an obtuse angle.

An obtuse angle is an angle that measures greater than 90°.

Which type of angle is measured in degrees or radians?

  • Acute angle (correct)
  • Right angle
  • Straight angle
  • Obtuse angle

Define an acute angle.

<p>An acute angle is an angle that measures less than 90°.</p>
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Define a straight angle.

<p>A straight angle is an angle that measures 180°.</p>
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Define a reflex angle.

<p>A reflex angle is an angle that measures greater than 180° and less than 360°.</p>
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Which type of angle measures greater than 90°?

<p>Obtuse angle (A)</p>
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Which type of angle measures less than 90°?

<p>Acute angle (B)</p>
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Which type of angle measures 180°?

<p>Straight angle (B)</p>
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Which type of angle is measured greater than 180° and adds to an angle to make 360°?

<p>Reflex angle (C)</p>
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Study Notes

Angle Types

  • A right angle is an angle that measures 90°.
  • An obtuse angle is an angle that measures greater than 90° but less than 180°.
  • Angles can be measured in degrees or radians.
  • An acute angle is an angle that measures less than 90°.
  • A straight angle is an angle that measures 180°.
  • A reflex angle is an angle that measures greater than 180° and adds to an angle to make 360°.
  • Obtuse angles measure greater than 90°.
  • Acute angles measure less than 90°.
  • Straight angles measure 180°.
  • Reflex angles measure greater than 180° and add to an angle to make 360°.

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