Posted by **Dominique** on Tuesday, December 18, 2012 at 9:07pm.

Obtuse angles A and B are in standard position. Point P(-3,4) is on the terminal arm of angle A. Point Q(-9,12)is on the terminal arm of angle B. How are the measures of angles A and b related?

Please explain...

- Math -
**Reiny**, Tuesday, December 18, 2012 at 9:42pm
If you put P and Q on the same grid, did you notice that OQ is an extension of OP ?

so the angle formed by OP and OQ are the same

notice the hypotenuse of the smaller triangle is 5 by Pythagoras, and of the larger triangle it is 15

try this on your calculator:

2nd

cos

(

-3÷5

)

= to get 126.8698...°

now try:

2nd

cos

(

-9÷15

)

=

to get exactly the same angle of 126.8698...°

## Answer This Question

## Related Questions

- Advanced Functions - x and y represent two angles in standard position. x has ...
- Math - The point P(k,24) is 25 units from the origin. If P is on the terminal ...
- math - trigonometric functions/ radians the angle Ə is in the first ...
- math - There is a square whose vertices lie on a unit circle. Point P lies on ...
- math:) - If the given point is on the terminal arm of an angle A in standard ...
- precal - the point P(4,-3) lies on the terminal arm of an angle theta in ...
- trig - (a) sketch an angle A in standard position whose terminal ray passses ...
- Math - The point (-8,3) lies on the terminal arm of angle theta in standard ...
- math - The point (5,-6) is on the terminal arm of the standard position angle&#...
- Pre-Calculus ( Trigonometry) - The point P(k, 24) is 25 units from the origin. ...

More Related Questions