Question

If the area of a semi-circular field is 15400 sq m, then perimeter of the field is: |(a) 160/7m (c) 360 /2m (b) 260/2 m (d) 460 /7m​

Answer 1

Answer:

Area of semi-circle = πr²/2  

Perimeter of semi-circle = πr + 2r ( Diamter length will also add in perimeter remember this) .

Calculation :------  

  → πr²/2 = 15400

→ πr² = 15400×2  

→ r² = 15400×2 × 7/22  

→ r² = 7×7×100×2

→ r = 7×10×√2 = 70√2 m

Now, perimeter = πr + 2r ,

 putting values we get,

→ perimeter = 22/7 × 70√2 + 2(70√2)

→ perimeter = 22×10√2 + 140√2

→ perimeter = 220√2 + 140√2  

→ perimeter = 360√2 m .

Hence , perimeter of semi-circle will be 360√2m .

Answer 2

Step-by-step explanation:

here is ur answer........