# A circle centered at the origin runs through the point negative 6 and a positive 8 What is the radius of the circle?

1. Draw a coordinate grid.

2. Put the point (-6, 8) on the grid.

3. Notice you can draw a right triangle. (From origin go 6 left. Make a point. Then go 8 up)

5. Use pythagorean theorem to find hypoteneuse.

6. 62 + 82 = r2

### Why is cosine negative in the third quadrant?

On a Unit Circle, the cosine is the x coordinate of the point on the circle represented by an angle. Angles greater than 90Â° (pi/2 radians) and less than 270Â° (3*pi/2 radians) are to the left of the y-axis, so x is negative. Quadrant I is the upper right quadrant (x positive, y positive) 0Â° < Éµ < 90Â° Quadrant II is the upper left quadrant (x negative, y positive) 90Â° < Éµ < 180Â°…

### How many parts in an atom?

Mainly, there are 2 parts, the outer circle is made of electrons, and the inner circle is made of protons and neutrons. Protons have a positive charge, neutrons have no charge at all (they are neither negative nor positive), and electrons have a negative charge, so they cancel out the effects of the protons. I hope this helps you, and to my knowledge, this is accurate. References: Chemistry Counts Second Edition by Graham Hill.

### You took an EPT pregnancy test the circle was negative and the box was positive what does that mean?

### Why cos negative results positive?

It doesn't really. Depending on the exact value of the argument, the cosine function can give both positive and negative results, for a negative argument. As to "why" the sine, or cosine, functions have certain values, just look at the function definition. Take points on a unit circle. The sine represents the y-coordinate for any point on the circle, while the cosine represents the x-coordinate for such a point. (There are also other ways to…

### Why does cos negative theta equals positive theta?

You must think of the unit circle. negative theta is in either radians or degrees and represents a specific area on the unit circle. Remember the unit circle is also like a coordinate plane and cos is the x while sin is the y coordinate. Here is an example: cos(-45): The cos of negative 45 degrees is pi/4 and cos(45) is also pi/4

### How would you draw a regular pentagon?

*Note that it is assumed you know what the terms diameter, perpendicular, bisect/bisection and intersection mean in relation to geometry. If not, they are explained in the discussion area. To construct a regular pentagon using a compass and ruler (a longer, but more precise method): # Draw a circle in which to inscribe the pentagon and mark the center point O. # Choose a point A on the circle; this will be one vertex of…

### What is a line through a circle that does not go through the center?

A line through a circle that does not go through the center of the circle is a secant line. A line through a circle that does go through the center is still a secant line, by the way. Compare this to a line segment that has its two endpoints on the circumference of the circle. That line segment is a cord of the circle. If that cord of the circle passes through the center of…