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Answers
Answer:
9 sol. area= area of bigger circle- smaller circle
π(14²-7²)
π147
461.81 cm²
Answer:
Q.9
Ans. ⬇️
Firstly we find area of circle.
=> Radius of circle = 14 cm
=> Area of circle = πr²
=> 22/7 × 14 × 14
=> 616 cm²
Now, find the area of two semicircle.
=> Radius of semicircle = 14/2 = 7 cm
=> Area of semicircle = 1/2(πr²)
=> 1/2 × 22/7 × 7 × 7
=> 1/2 × 154
=> 77 cm²
We know that there is two semicircles. So,
=> Area of two semicircles = 2 × 77
=> 154 cm²
Now we find area of shaded region.
=> Area of shaded region = area of circle - area of semicircles
=> 616 - 154
=> 462 cm²
So, 4th option is correct answer.
Q. 10
Ans. ⬇️
There is shaded region which is a triangle.
We have,
CD = 6cm
CE = 10 cm
DE = ?
Firstly we fine DE by Pythagoras theorem.
H² = B² + P²
(CE)² = (CD)² + (DE)²
10² = 6² + (DE)²
100 = 36 + (DE)²
100 - 36 = (DE)²
64 = (DE)²
√64 = √(DE)²
DE = 8 cm
Now we find area of triangle.
Area of triangle = 1/2 × b × h
=> 1/2 × CD × DE
=> 1/2 × 6 × 8
=> 24 cm²
So, 2nd option is correct answer.
Step-by-step explanation:
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