Geometry... Please help and I'll mark brainliest. Triangle proofs & reasons
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Arc length has a formula that is similar to arc measure, but arc length is expressed in inches or meters or miles, etc., whereas measure is expressed in degrees, like an angle. The formula for each take this into account. Since the arc length is part of the length of the outside of the circle, the formula includes the circumference for a circle. 
, where theta is the degree measure of the central angle intersecting the arc you're looking for, and d is the diameter of the circle. Our formula would look like this with the info we have: 
which can be simplified to 
which can be simplified even further to 
. And that's your answer!
The formula of the volume of a cylinder:
We have:
and
substitute:
Answer: The area of a base of the cylinder is equal 45 dm².
We have:
and
substitute:
Answer: The area of a base of the cylinder is equal 45 dm².