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If the circumference of a spherical object is 43.96 ​cm, what is the surface area of the​ object? Use 3.14 for pi im doing math with surface area fora sphere

Respuesta :

apologiabiology
c=2pir
SA=4pir^2

43.96=2pir
divide both sides by 2
21.98=pir
divide both sides by pi (aprox pi to 3.14)
7=r

SA=4pir^2
SA=4pi7^2
SA=4pi49
SA=196pi

aproxpi=3.14
sa=615.44 cm^2
Solutions 

Finding the sum of all the areas of each face on a 3-D object is called calculating the surface area. To calculate the surface area you use the formula  c=2πr. 

Calculate 

SA = 4πr² 

43.96 = 2πr

Divide each of the side by 2

43.96 = 2πr ÷ 2 

21.98 = πr

divide both sides by π (approximate π to 3.14)

7=r


SA=4πr²

SA=4π7²

SA=4π49

SA=196pi

SA =615.44 cm²




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