Friday

August 22, 2014

August 22, 2014

Posted by **Nicole** on Tuesday, December 18, 2012 at 10:11pm.

a) (4,3)

b) (12,5)

c) (-6,8)

d) (-24,7)

PLEASE help me!! with the steps and all i have no idea about this... thankyou so much!!

- math:) -
**Reiny**, Tuesday, December 18, 2012 at 10:29pmIf you are just learning this, I suggest you make a sketch of the right-angled triangle

a) and b) will be in quadrant I

c) and d) will be in quadrant II

I will do b) and c)

b) by Pythagoras, it is easy to find the hypotenuse to be 13

since cosŲ = 12/13

use the cosine inverse of your calculator...

enter:

2nd

cos

(12÷13)

= to get appr 22.62° or 23°

c) hypotenuse^2 = (-6)^2 + 8^2 = 100

hypot = √100 = 10

cosŲ = -6/10 = -3/5 or -.6

enter:

2nd

cos

(-.6)

=

to get 126.87° or 127°

**Related Questions**

Math - Obtuse angles A and B are in standard position. Point P(-3,4) is on the ...

Grade 11 math - If the given point is on the terminal arm of an angle A in ...

Math - The point P(k,24) is 25 units from the origin. If P is on the terminal ...

URGENTANIUS!! - If the given point is on the terminal arm of an angle A in ...

math - There is a square whose vertices lie on a unit circle. Point P lies on ...

math - trigonometric functions/ radians the angle Ə is in the first ...

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- Trigonometry - The point, in on the terminal side of an angle in standard ...

Calculus - The point A(-3, -5) is one the terminal arm of an angle feta. ...