Respuesta :

serrata
A=πr^2
square the radius 3cm which is equal to 9cm. you then multiply 9cm by pi 3.14. you'll get 28.27 cm. and I can't see the other circle
To find the area of a circle we use this equation.(a = area, r = radius)
a = π · r²
Let's put the radius of the first circle into the equation. a = π · 3²Solve. a = π · 9a = 28.26
The answer for the first one is 28.26. or 9π
Now the second one. 

a = π · 10²Solve. a = π · 100a = 314.2 or 100π

The answer for the second one is 314.2 or 100π

Hopefully this helps! If you have any more questions or don't understand, feel free to DM me, and I'll get back to you ASAP! :)

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