What is the best approximation for the perimeter of a semicircle with a diameter of 12 cm?

use 3.14 to approximate pi.

18.84 cm

30.84 cm

61.68 cm

75.36 cm

Option 2

Step-by-step explanation:

if you multiply by 1/2 by pi times diamter give you 18.84 plus 12 would give you 30.84

srry ask agian

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0