Ellen has 3/4 jar of jelly, after she makes sandwhichs, she has 2/5 jar of jelly left, how much jelly did she use?
2 answers:
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Answer:
376.991 cm²
Step-by-step explanation:
Surface Area = 2π(5²) + 2π(5)(7)
= 50π + 70π
= 120π
= 376.9911184... ≈ 376.991
<h2>Derive Surface Area of A Cylinder</h2>If you take a look at a net of a cylinder, you can see it is composed of two circles(bases) and a rectangular strip with the length of the diameter of the circle
The formula for the area of a circle = πr², and since there are 2, it is 2πr²
The formula for circumference of a circle = 2πr, and since we are multiplying that by the height by the height of the cylinder, it is 2πrh
∴ 2πr² + 2πrh
we are given
we can solve for x
We can isolate x
step-1: Multiply both sides by b/a
step-2:Add 12 both sides
step-3: combine right side
step-4:Divide both sides by 2
..............Answer