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1 l Find the perimeter of a circle whose area is 154 cm?​

Sagot :

Answer:

44

Step-by-step explanation:

The formula to find to area of a circle is [tex]\pi r^{2}[/tex]= Area

The perimiter formula is [tex]2\pi r[/tex] = Perimeter

Since we know the area (154cm)  we can find the radius (r) with the formula.

You first have to find what the radius of the circle is with.

[tex]\pi =3.14[/tex]

[tex]\pi r^{2}[/tex]= 154

3.14[tex]r^{2}[/tex]=154

Now simplify.

[tex]r^{2}[/tex]=49 (rounded)

r=7

Now we can find the perimeter with the formula above.

[tex]2\pi r[/tex]= P

Now plug in.

2(3.14)(7)= P

44=P (Rounded)