Math, asked by Anonymous, 1 month ago



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Answered by chinmaya1729
0

Answer:

9 sol. area= area of bigger circle- smaller circle

π(14²-7²)

π147

461.81 cm²

Answered by Hezal12
1

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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