C = pi×diameter OR C = 2pi×radius
So...
17.8 = pi×diameter 17.8 = 2pi×radius
17.8/pi = diameter 17.8/2pi = radius
<span>5.66591597407 = diameter or d
</span><span>2.83295798704 = radius or r</span>
Answer:
Step-by-step explanation:
9.65+0.4=10.05
16.058-1.2=14.858
Geometric series are in the form of

Where a is the first term and r is the common ratio .
And it is given that




r=-3,2
So the first five terms are

= 2-6+18-54+162 or 2+4+8+16+32
= 122 or 62