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Math Help - Trig Function of Real #s Help!

  1. #1
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    Trig Function of Real #s Help!

    I have four problems I need my answers checked and explained in Baby Steps. I am trying to figure out the best way to solve these problems.

    1. Convert pi/4 radians to degrees

    My answer is 45 Degrees... Please explain best way to get this answer!

    2. If a circle has a radius of 29cm, determine the length of an arc s subtended by an angle of 37 Degrees.
    My answer... Please explain best way to get answer
    s= 18.72738287cm

    3. Find the point (x,y) on the unit circle which corresponds to teh angle -70pi/3.
    a). Express your answer in radical form
    b). Express your answer in decimal form
    My answers... Please Explain easiest way to complete problems
    a. (x,y) = (-1/2, SquareRoot of 3/2)
    b. (x,y) = (-.5, .866025904)

    4. Two pulleys are connected by a belt. The radius of one pulley is 9cm and the radius of the other is 77cm. If the larger one rotates once, how many times N does teh small one rotate?
    My answer...please explain best way to complete problem
    N= 77/9


    Thank You for your help. I am terrible at Pre-Cal, and I just want to make sure I am completing these problems in the best way possible! I have 4 More to come!
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  2. #2
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    Joined
    Aug 2008
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    Quote Originally Posted by Atav20 View Post
    I have four problems I need my answers checked and explained in Baby Steps. I am trying to figure out the best way to solve these problems.

    1. Convert pi/4 radians to degrees

    My answer is 45 Degrees... Please explain best way to get this answer!

    2. If a circle has a radius of 29cm, determine the length of an arc s subtended by an angle of 37 Degrees.
    My answer... Please explain best way to get answer
    s= 18.72738287cm

    3. Find the point (x,y) on the unit circle which corresponds to teh angle -70pi/3.
    a). Express your answer in radical form
    b). Express your answer in decimal form
    My answers... Please Explain easiest way to complete problems
    a. (x,y) = (-1/2, SquareRoot of 3/2)
    b. (x,y) = (-.5, .866025904)

    4. Two pulleys are connected by a belt. The radius of one pulley is 9cm and the radius of the other is 77cm. If the larger one rotates once, how many times N does teh small one rotate?
    My answer...please explain best way to complete problem
    N= 77/9


    Thank You for your help. I am terrible at Pre-Cal, and I just want to make sure I am completing these problems in the best way possible! I have 4 More to come!
    your all answers are right. what else are you looking for?
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  3. #3
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    Joined
    Aug 2008
    Posts
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    I was looking for a step-by-step decription of the best way to complete each problem.
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