Answer:
15
Step-by-step explanation:
12 x .25= 3
3+12= 15
180
30+60+90
90+90
we have add all the angle
Factor x^2 - 3x - 40
(x - 8)(x + 5) = 0
Solve for x
<u>x = 8, -5</u>
Since the diameter is 2.1 then its radius is 1.05.
Therefore the circumference is .