SOLUTION: I know this is an easy question but I kept getting it wrong. Could you please help? If the circumference of a circle is dtt, then the circumference of a a semi-circle is ? Would i

Algebra ->  Circles -> SOLUTION: I know this is an easy question but I kept getting it wrong. Could you please help? If the circumference of a circle is dtt, then the circumference of a a semi-circle is ? Would i      Log On


   

Question 85544: I know this is an easy question but I kept getting it wrong. Could you please help? If the circumference of a circle is dtt, then the circumference of a a semi-circle is ? Would it be .5(dtt) I am not sure
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Circumference of a circle:
C=d%2Api or C=2%2Ar%2Api since d=2r

so the circumference of a semicircle is half of the circumference of a circle
Circumference of a semicircle:
C=d%2Api%2F2 or C=cross%282%29%2Ar%2Api%2Fcross%282%29=r%2Api