Homework Help: math - 8th grade

Posted by Br on Sunday, May 8, 2011 at 12:23pm.

I have a table to complete.Given that points A and B belong to a circle with centre O; If the area of the sector bounded by central angle AOB is 14.13cm squared and the measure of central angle AOB=45cm squared. What is the radius of the disk(cm)and what is the area of the disk(cm squared)

math - 8th grade - Henry, Sunday, May 8, 2011 at 8:58pm
As = (45/360)Ac = 14.13cm^2.

0.125Ac = 14.13,
Ac=113.4cm^2 = Area of disk or circle.

3.14r^2 = 113.4cm^2,
r^2 = 36,
r = 6cm = radius of disk.

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