<p>Pg 464 #19, I have no idea how to do this. I tried area of a sector formula but I did not succeed. Anyone care to help me out?</p>
<p>If you could post up the actual questions, I'd like to take a stab at it.</p>
<p>Well it's a picture, but I'll try to describe it.
P is the center of a circle. QR is the arc of a circle with center P. If the length of arc QR is 6pi, what is the area of sector PQR? Angle P = 30 degrees</p>
<p>alrite, i'll try, but be warned that im awful at geometry</p>
<p>30 is 1/12 of total number of degrees (360) so 6pi must be 1/12 of total circumference-->72pi
72pi=2rpi so the radius is 36
now the area is also 1/12 of the total so pi(36)^2/12=108pi </p>
<p>so yea, i would go with 108pi</p>
<p>well if the arc of QR is 6pi, and P is 30 degrees, that means that the whole circle as a circumference of 12 x 6 pi, which is 72 pi. If the circumference is 72 pi, the radius would be 36. Thus, to find the area of sector PQR, find the area of the whole circle, pir^2 and multiply that by (30/360). I hope that makes sense =)</p>
<p>Thanks guys, I get it now.</p>