Figure 1. |
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Here, we have an angle Angle. We can call it either angle CAB (or BAC), or angle 1.

Angles are measured using degrees, as shown below.

Figure 2. |
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Acute Angle |
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An Acute Angle is an angle between 0 and 90 degrees. |

Figure 3. |
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Right Angle |
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A Right Angle is an angle that is exactly 90 degrees. |

Figure 4. |
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Obtuse Angle |
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An Obtuse Angle is an angle between 90 and 180 degrees. |

Figure 5. |
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Straight Angle |
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A Straight Angle is an angle that is exactly 180 degrees. |

Figure 6. |
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