If you have a circle with center c how do you located the vertices of a of a square inscribed in circle c

You'd either have to provide a value for the circle radius, r, or use the variable "r" for that purpose.  

Draw a circle of radius r.  In the first quadrant, draw a sample radius from circle center c to the circle.  The angle between this radius and the x-axis is 45 degrees.  Thus, you can find the x- and y-coordinates of one vertex using the following formulas:

x = r*cos 45 deg
y = r*sin 45 deg

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

Ithink the answer is c