How would you find the area of the shaded regions in these two pictures

Question

anonymous · Answer

attachment

anonymous · Answer

First one is $$\pi r ^{2}$$

Second one is 

$$sr \theta$$

Change your theta to radians for the second one.

anonymous · Answer

so the first on would be 70.84 in^2?

anonymous · Answer

The equation for the first one should look like 

$$\pi(4.75)^{2}$$

anonymous · Answer

So sqaure 4.75 and then multiply it by $$\pi$$

anonymous · Answer

okay that makes since for the first one

anonymous · Answer

on the second one im still not sure what you ment

anonymous · Answer

Ah sorry I wrote that wrong it is $$S = r \theta$$

This means the area of the shaded region is equal to the radius multiplied by the angle. Change the angle to radians by multiplying it by 
$$\pi/180$$

anonymous · Answer

so pi/180=.0174

anonymous · Answer

What math are you in?

anonymous · Answer

geometry

anonymous · Answer

Ah no wonder. Lol. I'm trying to make you use trig methods.

Here,

Multiply the 80 or whatever that is on the outside of that shaded region by $$\pi/180$$

Then you simply that to get $$8\pi/18$$ Which can be simplified further to $$4\pi/9$$ Now you multiply, I beliebe it says 8.9?, by that using 3.14 for pi.

Itd look like this $$8.9(4\pi/9)$$

anonymous · Answer

And your answer would be 12.42 in^2

anonymous · Answer

okay.. thank you

anonymous · Answer

Sorry if that's confusing :S

It's trigonometry.

anonymous · Answer

ios okay