Question

If the area of a semicircle is 154cm2 . Find it’s diameter

Answer 1

Answer:

19.80cm

Step-by-step explanation:

Area of semicircle = $\pi$r^2/2

154=3.14*r^2/2

=>154*2=3.14*r^2

=>308/3.14=r^2

=>98.08=r^2

=>9.90 = r

diameter= 2r=2*9.90=19.80cm

Pls mark this as the  Brainliest answer!!!

Answer 2

$\bold{\huge{\underline{\underline{\rm{ Solution:}}}}}$

ɢɪVEɴ :–

• Area of semi circle = 154 cm²

TO FIND :–

• Diameter of circle = ?

SOLUTION :–

$\longrightarrow \: Area of the circle =\pi {r}^{2}$

$\longrightarrow \: Area of semi\:circle= \frac{1}{2} \pi {r}^{2}$

☯ According to the Question.

$\longrightarrow \frac{1}{2} \pi {r}^{2} = 154$

$\longrightarrow \: \pi {r}^{2} \implies \: 154 \times 2$

$\longrightarrow \frac{22}{7} {r}^{2} = 308$

${r}^{2} = 308 \times \frac{7}{22}$

${r}^{2} = 98$

$r = \sqrt{98}$

And

$\longrightarrow\:Diameter= 2r$

$\longrightarrow \: Diameter = 2 (\sqrt{98} )$

$\longrightarrow \: Diameter = 14 \sqrt{2} cm$