one disk of 20cm radius, out of that 4 disk of 5cm are cut , find diffrence of leftout and cut out area?	Choose the correct choice:
A) 200pi
B) 300pi
C) 100pi
D) 400pi
E) 500pi
Radius r=20cm   Total areal of big disc = pi* r^2 = pi * 20 * 20 = 400 pi   Total cut out area = 4 * pi * 5 * 5 = 100 pi   Difference between them = 400 - 100= 
<gadget id="calculator">400 - 100</gadget>
<output>300</output>
300pi   ANSWER:300pi
<result>B</result>
one disk of 20cm radius, out of that 4 disk of 5cm are cut , find diffrence of leftout and cut out area?