Consider a circle (radius R) to be made up of many concentric rings of radius r and thickness dr. Find the area, dA, of one of t
hese rings and integrate from 0 to R to get the area of the circle. Remember, the area of a very thin ring is just the circumference times the thickness. For something a bit more challenging, try to set it up as a sum of thin parallel bars rather than a sum of rings.
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Answer:
10 units²
Step-by-step explanation:
The shape is a triangle.
The area can be found by multiplying the base (in units) with height (in units) divided by 2.
base = 4 units
height = 5 units
