### Author Topic: The meaning of cos? and sin?  (Read 19200 times)

#### Fu-Kwun Hwang

• Hero Member
• Posts: 3062
##### The meaning of cos? and sin?
« on: October 13, 2014, 08:28:41 pm »
You can drag the tip of blue of red arrow to change the angle.

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

#### lookang

• Hero Member
• Posts: 1772
• http://weelookang.blogspot.com
« Last Edit: November 01, 2014, 02:16:31 pm by lookang »

#### Rolandcharcker

• Newbie
• Posts: 1
##### Re: The meaning of cos? and sin?
« Reply #2 on: January 16, 2015, 03:05:26 pm »
An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. Angles provide a means of expressing the difference in slope between two rays meeting at a vertex without the need to explicitly define the slopes of the two rays. Angles are studied in geometry and trigonometry.
sin theta is = to opposite/hypotenuse.
cos theta is = to adjacent/hypotenuse.
tan theta is = to opposite/ adjacent. -*-