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# Lesson 9 Review

### Review of Information Needed to Complete Lesson 9 of Math III Unit 4

Question | Answer |
---|---|

What are you finding when you use the following formula: A=1/2 bh? | Area of a Triangle |

What formula is used to find the area of a rectangle? | A = LW (Area equals length times width) |

What is the formula for finding the area of a circle? | A=pi(r^2) (Area equals pi times the square of the radius) |

Define circumference. | The circumference of a circle is the distance around the circle. |

When do you use the following formula: C=2(pi)r? | Circumference of a Circle |

Define arc length. | The distance along the arc (part of the circumference of a circle, or any curve). |

How is arc length calculated? | Arc Length = θ × r (when θ is in radians) Arc Length = (θ × π/180) × r (when θ is in degrees) |

What is a central angle? | A central angle is formed by two radii that start at the center and intersect the circle itself. |

When is the Pythagorean Theorem used? | The Pythagorean Theorem is used when working with a right triangle. |

What is a net? | A geometry net is a 2-dimensional shape that can be folded to form a 3-dimensional shape. Also, a net may be defined as a pattern made when the surface of a three-dimensional figure is laid out flat showing each face of the figure. |

Created by:
Jeanievictory