Answer:
one is correct.
Step-by-step explanation:
because it have one solution when you graph it
Answer:
420.72
Step-by-step explanation:
Answer:
8 inch
Step-by-step explanation:
radius is half the diameter
It should be a cylinder generated by the rotation. Take a piece of paper or book and rotate it with one edge as the center, and visualize what shape it makes. Doing something like this will be the best way to understand what shape it forms.
Answer:
The arc length of the semicircle is
or 
Step-by-step explanation:
The complete question in the attached figure
we know that
The circumference of a semicircle is given by the formula

where
D is the diameter of the semicircle
we have

substitute

----> exact value
Assume

----> approximate value
therefore
The arc length of the semicircle is
or 