Question

.. Area of semicircle


Ex. 2. Use 1 = 3.14 to find the diameter of a semicircle whose area is 3925 cm².​

Answer 1

Answer:

257

Step-by-step explanation:

Area of semicircle = 3925 cm²

But, we know that area of semicircle = $\frac{\pi r^{2} }{2}$

⇒ πr² = 2 x 3925

⇒ r² = $\frac{7850}{3.14}$ = $\frac{785 x 1000}{314}$ = 25 x 100

⇒ r = 5x10 = 50 cm

Now, We know that,  Diameter of semicircle = 2r + πr

⇒ 2(50) + 3.14(50)

⇒ 100 + 157 = 257

Hope this helps.....