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whitewesley124
03.02.2020 •
Mathematics
Somebody pls what is the approximate area
Solved
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Ответ:
20.36
Step-by-step explanation:
The area of the whole circle is pi*3.6^2 = 40.715 (rounded). However, the shaded portion is only half of the circle, since the arc is 180 degrees, so we divide this by 2 to get about 20.36.
Ответ:
From this picture the smaller triangle is mirrored across the X and Y axis so AD and EC are the same leg
AD= 12 and EC = 3
The scale factor is 12/3 = 4, this means that DB is 4 times larger than BE
So we can set up an equation and solve:
k+5 = 4(k-7)
Distribute the right side:
k+5 = 4k-28
subtract 1 k from each side:
5 = 3k -28
add 28 to each side:
33 = 3k
Divide both sides by 3:
k = 33/3
k = 11
Now we know the value for k we can calculate BE by replacing k with 11:
BE = k-7
BE = 11-7
BE = 4
The length of BE is 4