Find the area of the shaded region of the concentric circles of radii of 17.5 cm and 21cm,as shown in the figure here.
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8
Answer:
423.5 cm^2 is the correct answer.
Step-by-step explanation:
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2
Answer:
302.5 sq cm
Step-by-step explanation:
radius of outer circle= R= 21 cm
radius of inner circle = r =17.5 cm
area of shaded region = area of outer circle - area of inner circle
= π [R+r][R-r]
= π [21+17.5][21-17.5]
= 22/7× 38.5×2.5
= 302.5 sq cm
the area of the shaded region = 302.5 sq cm
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