In the figure, centres A, B, C of the semicircles are on the line. The radii of the un-shaded semicircles are in the ratio 1: 3. The radius of the smallest semicircle is 2cm .
a) Find the area of the semicircle with centre at A.
b) Find the area of the semicircle with centre at B.
c) Find the area of the shaded region.
Answers
Answered by
0
Step-by-step explanation:
pls complete u question or sent pic
Answered by
0
Answer:
Hey mate here is your answer..check it out..
Step-by-step explanation:
Answer
Area of shaded region = Area of larger semicircle − Area of circle
−2 (Area of small semi-circle)
+Area of small semi-circle
=
2
π
(4.5)
2
−π(
2
4.5
)
2
- area of small semi-circle
=
2
π
(4.5)
2
−π(
2
4.5
)
2
−
2
π
(
2
3
)
2
=π[
2
(4.5)
2
−(
2
4.5
)
2
−
2
1
(
2
3
)
2
]
=π×3.9375=12.375cm
2
Cost of painting = Rs. (12.375×0.25)≈Rs.3
Similar questions