Selasa, 06 Maret 2012

LINES ANG ANGLES


2. MEASURE OF ANGLES
The unit measurement of angles is degree, which is denoted by . The measure of the angle for one rotation is .
One full rotation of minute hand of a wall clock is equal to 60 minutes. 1 minute is equal to 60 seconds. You can also find the same thing on degree’s unit.
1 degree = 60 minutes, denoted by 
1 minute = 60 seconds, denoted by 
Example:
Solve the following problems.
1.
2.
3.
4.
5..
SOLUTION:
1. We have    so that .
2. We have   so that .
3. We have  so that .
4. We have   so that .
5. We have    degrees, so that    degrees =.
3. ADDITION AND SUBTRACTION ON ANGLES.
The followings should be considered whenever we want to add and subtract the angles.
  • The counterclockwise rotation of an angle results the positive value of its measure.
  • The clockwise rotation of an angle results the negative value of its measure.
EXAMPLE:
Determine the result of:
1..
2. .
3..
4..
5.
SOLUTION:
1.= .
2.
=.
3.
=.
4. =
=
5.

=
.

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