# A First Look at Angles

## Instructions

#### Warning: Allow the Graphics and Java Applets to fully load before clicking anywhere

*If you accidentally interupt the transmission before it is finished by clicking
somewhere, you must press the "Refresh" button to start all over again from the beginning*

## The Questions YOU need to answer

- What is the measure of angle
*<AOC* when A=(15,20)?

- What is the measure of angle
*<AOD* when A=(15,20)?

- What is the name of the relationship between
*<AOC* and *<AOD*?

- What are the co-ordinates of point
*O* (test your answer by moving point
*A* there)?

- What co-ordinates for point A make
*<AOC* a right angle?

- What co-ordinates for point A make
*<AOC* a straight angle?

- What co-ordinates for point A make
*<AOC* a 60° angle?

- Change the co-ordinates for point A but keep the identical 60° angle.
What are the new coords?

- Keeping
*A* at (10, 20). Where can you place point *B* so that ray *OD*
bisects *<AOB*?

- Where can you place A and B so that
*<AOC* is complementary to *<BOD*?

- Move
*A* to (10, 20). Where can you place point *B* so that *<AOC* is a vertical
angle to *<BOD*?

- Can you find a "formula" or express a "recipe" to generate the co-ords of the vertical angle?
*(Hint: Keep point **B* the same. Notice the horizontal and vertical change as it goes to *O*.
Now you need to make the same changes to *O* to get to *A*.
Check your work by making sure the angles match)

Click here if you have time

*Send me e-mail (cct@ktb.net)*