Question

whats the perimeter of a semicircle if the diameter is 8​

Answer 1

Answer:

the perimeter of semicircle is 25.136

Step-by-step explanation:

here given that d=8

we know that

r=d/2

=8/2 = 4

perimeter of semicircle = 2πr

2×π×4

=25.136

Answer 2

Given :

• Diameter of semicircle = 8 cm

To Find :

• Perimeter of the semicircle.

Calculation :

Firstly, we need to calculate the radius of semicircle,

Formula -

• $\underline{ \boxed{ \rm{Radius = \dfrac{Diameter}{2}}} }$

$: \implies \rm Radius = \dfrac{8}{2}$

By dividing,

$: \implies \red{\rm Radius = 4 \: cm}$

Thus, radius of semicircle is 4 cm.

$\dag$ According to the Question,

Now, let's calculate the perimeter of a semicircle. Formula is given by -

$\underline{ \boxed{ \rm{Perimeter_{(Semicircle)} = \pi \: r \times 2r}}}$

Putting the values,

$: \implies \rm Perimeter_{(Semicircle)} = 3.14 \times 4 + (2 \times 4)$

Multiplying the numbers,

$: \implies \rm Perimeter_{(Semicircle)} =12.56 + 8 \: cm$

Adding the numbers,

$: \implies \underline{\boxed{\rm {Perimeter_{(Semicircle)} = 20.56 \: cm }}} \red{ \bigstar}$

Therefore, perimeter of semicircle is 20.56 cm.