Five hundred eight billion, four hundred eight million, three hundred sixty thousand, nine.
40 prizes were dolls : divide 64 by 8 and you get 8. then multiply 8 by 5 and get 40
To find the slope of the line containing the pair of points, subtract y2 to y1 and divide x2-x1.
y2-y1
--------
x2-x1
If it’s a half circle, the central angle should be 180 degrees.
