Download - 3-2: Angle Measure
Transcript
DEGREE: The unit of angle measureUses 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
obtuse right acute
The measure for B is 138˚. Solve for x.
5x – 7 = 138 +7 +7
5x = 1455 5
x = 29
Assignment◦ Worksheet #3-2