Determine the 3rd term in the geometric sequence whose first term is -8 & whose common term is 6

so the formula for finding the n th term in a geometric sequence is :

(first term) *

therefore:

the 3 rd term will be

(-8) * (6)^2

-8 * 36

-288

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).