If the area of the circle isFind the area of shaded portion.Want with

1.	If the area of the circle isFind the area of shaded portion.Want with formula
Answer» Answer: Draw RM⊥AB AM=MB= 2 AB =18 cm AP=PM=MQ=QB= 2 18 =9 cm MR=AM=18㎝ CM=RM−CR=18−r PC=PE+EC=9+r In triangle CMP PC 2 =CM 2 +PM 2 ⇒(9+r) 2 =(18−r) 2 +9 2 ⇒81+18r+r 2 =324−36r+r 2 +81⇒54r=324⇒r=6 cm ∴Area of shaded region=area of semi circle AB−2 area of semi circle-area of circle = 2 1 π×18 2 −2× 2 1 ×π×9 2 −π×6 2 Step-by-step explanation:

If the area of the circle isFind the area of shaded portion.Want with formula

Answer»

Answer:

Draw RM⊥AB

AM=MB=

=18 cm

AP=PM=MQ=QB=

=9 cm

MR=AM=18㎝

CM=RM−CR=18−r

PC=PE+EC=9+r

In triangle CMP

=CM

+PM

⇒(9+r)

=(18−r)

⇒81+18r+r

=324−36r+r

+81⇒54r=324⇒r=6 cm

∴Area of shaded region=area of semi circle AB−2 area of semi circle-area of circle

π×18

−2×

×π×9

−π×6

Step-by-step explanation: