 DEGREE:The unit of angle measure Uses the symbol ˚  PROTRACTOR: A tool for measuring and sketching angles of a given measure.

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Presentation transcript:

 DEGREE:The unit of angle measure Uses the symbol ˚  PROTRACTOR: A tool for measuring and sketching angles of a given measure.

 Use a protractor to measure DEF ◦Place the center middle of the protractor on the angle ◦Note where the 0 (not the 180) is: top or bottom ◦Measure the other angle using numbers on the same top/bottom  DEF = 125˚

 Find BXE, CXE, and AXB ◦BXE = ◦CXE = ◦AXB = 115˚ 85˚ 65˚

 RIGHT ANGLE: An angle with measure of 90˚  ACUTE ANGLE: An angle with measure between 0˚ & 90˚  OBTUSE ANGLE: An angle with measure between 90˚ & 180˚

 Classify each as acute, right, or obtuse angles obtuseright acute

 The measure for B is 138˚. Solve for x.  5x – 7 =  5x = 145 5 5  x = 29

 Assignment ◦Worksheet #3-2