If the radius of the circle is increased by 20% then area is increased by:
a.44% b.120% c.144% d.40% e.none of these

• a 44%
  
  let the radus be 100 ,then area =10000pi
  
  radius increased by 20% then r = 120, area = 14400pi
  
  change in area =4400
  
  percentage = 4400/10000 =44%
• 11 years agoHelpfull: Yes(35) No(1)
• let r=10 a=100
  r=12 a=144
  144-100=44
  44%
• 11 years agoHelpfull: Yes(11) No(0)
• Area of circle=pi*r^2
  Let the initial radius=100
  if area is increased by 20% then new radius=120
  hence difference in area=120^2-100^2=44
• 11 years agoHelpfull: Yes(8) No(1)
• increase in area = (x^2/100)+2x%
  where, x is the increase amount and that is 20
  so, 20*20/100 +2*20=44%
• 7 years agoHelpfull: Yes(1) No(0)
• relative percentage formula = p + p + ( ( p * p ) / 100 )
  so 20 + 20 + ( ( 20 * 20 ) / 100 ) = 44%
• 6 years agoHelpfull: Yes(0) No(0)