Circumference of a circle is 40 π cm. a quarter of the circle represents the developer layer genuine coupe. calculate the surface compartment.

We have to find the radius, how can we got it??



then





A quarter of the circle will have a surface of a quarter of the circle, there fore

this is the surface of the circle



a quarter of it



then we can replace the value of r





we can simplify 

Any pictures or something i need more info

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.