The length of minute hand of a clock is 5.4 cm. What is the area covered by this in 20 minutes
Options:  A) 15.27  B) 16.27  C) 17.27  D) 30.54  E) 30.27
area of circle is pi*r^2   but in 20 minutes area covered is  (20/60)*360= 
<gadget id="calculator"> (20/60)*360</gadget>
<output>120</output>
120 degree   so formula is pi*r^2*(angle/360)=3.14*(5.4^2)*(120/360)=30.54 cm^2   ANSWER:30.54
<result>D</result>
The length of minute hand of a clock is 5.4 cm. What is the area covered by this in 20 minutes