SOLUTION: This is not in our textbook but an extra credit question on homework. Can someone help please? What is the area and circumference of a circle with diameter 22 mm? (The instructor

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Question 193177: This is not in our textbook but an extra credit question on homework. Can someone help please?
What is the area and circumference of a circle with diameter 22 mm? (The instructor wants the exact solutions & wants us to include correct units with each!)This hurts!

Found 2 solutions by Mathtut, Alan3354:
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
C=%28pi%29d where d = diameter
:
A=%28pi%29r%5E2 where r is the radius
:
C=%28pi%29%2822%29=22%28pi%29mm
:
A=%28pi%2911%5E2=121%28pi%29%28mm%29%5E2%29

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
This is not in our textbook but an extra credit question on homework. Can someone help please?
What is the area and circumference of a circle with diameter 22 mm? (The instructor wants the exact solutions & wants us to include correct units with each!)This hurts!
------------------
The radius is half of 22 mm,
r = 11 mm
Circumference = pi*d = 22*pi mms (the exact answer)
22*pi = ~ 69.115 mms (approximately)
---------------
The area
A = pi*r^2
A = 121*pi square mms (exactly)
121*pi = ~ 380.133 mm^2 (apx)
No reason to panic.