We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
2243
1
avatar

Find θ correct to nearest degree:

Cos θ = 0.324

I dont understand this please help?

It's for holiday homework

Sin θ = 0.123

Tan θ = 0.783

please show me working out/explanation

 Jan 5, 2015

Best Answer 

 #1
avatar+17746 
+5

To find the size of the angle when you know the cos, use cos-1(0.324).

On hand-held calculators use (2nd) (cos) , enter 0.324 to get the answer:  71.1°.

On this calculator, use (2nd) (acos) and then enter the value.

"acos" means "arc cos", which is the inverse cosine.

Similarly, find sin-1(0.123) and tan-1(0.783), using (2nd) (asin) and (2nd) (atan).

 Jan 6, 2015
 #1
avatar+17746 
+5
Best Answer

To find the size of the angle when you know the cos, use cos-1(0.324).

On hand-held calculators use (2nd) (cos) , enter 0.324 to get the answer:  71.1°.

On this calculator, use (2nd) (acos) and then enter the value.

"acos" means "arc cos", which is the inverse cosine.

Similarly, find sin-1(0.123) and tan-1(0.783), using (2nd) (asin) and (2nd) (atan).

geno3141 Jan 6, 2015

23 Online Users

avatar