6616 cm2 respectively, then fi16 cm2 respectiIf the areas of two conce

1.	6616 cm2 respectively, then fi16 cm2 respectiIf the areas of two concentric circles are 154 cm2 andteof the circular path between them
Answer» Let r = radius of inner circlearea of inner circle = 154 cm²⇒πr^2=154⇒r^2=154×722=49⇒r=7cm Let R = radius of outer circlearea of outer circle = 616 cm^2⇒πR^2=616⇒R^2=616×722=196⇒R=14cm width of ring = R - r = 14 - 7 = 7 cm

6616 cm2 respectively, then fi16 cm2 respectiIf the areas of two concentric circles are 154 cm2 andteof the circular path between them

Answer»

Let r = radius of inner circlearea of inner circle = 154 cm²⇒πr^2=154⇒r^2=154×722=49⇒r=7cm

Let R = radius of outer circlearea of outer circle = 616 cm^2⇒πR^2=616⇒R^2=616×722=196⇒R=14cm

width of ring = R - r = 14 - 7 = 7 cm