\frac { 3 ( 2 ^ { n + 1 } ) - 4 ( 2 ^ { n - 1 } ) } { 2 ^ { n + 1 } - 2 ^ { n } }

answer: answer is b.

[m < b = 120º]

step-by-step explanation:

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .