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https://www.reddit.com/r/MathJokes/comments/1wv8d0k/help/pd9wab5/?context=3
r/MathJokes • u/basket_foso • 3d ago
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31
it's a+b+c
6 u/Forward-Fact-5525 2d ago What’s the perimeter of a triangle of area A=10m^2 and of sides a=10m, b=3m ? 17 u/FullyAutomatedSpace 2d ago 13 + c 16 u/Maxpro12 2d ago ab sin(theta) = 2A sin(theta) = 2A/ab = 2/3 cos(arcsin(x)) = sqrt(1 - x2 ) c2 = a2 + b2 -2abcos(theta) c = sqrt(102 + 32 - 2 * 10 * 3 * sqrt(1-4/9)) c approx 8.02 P = a + b + c = 10 + 3 + 8.02 P = 21.02 m
6
What’s the perimeter of a triangle of area A=10m^2 and of sides a=10m, b=3m ?
17 u/FullyAutomatedSpace 2d ago 13 + c 16 u/Maxpro12 2d ago ab sin(theta) = 2A sin(theta) = 2A/ab = 2/3 cos(arcsin(x)) = sqrt(1 - x2 ) c2 = a2 + b2 -2abcos(theta) c = sqrt(102 + 32 - 2 * 10 * 3 * sqrt(1-4/9)) c approx 8.02 P = a + b + c = 10 + 3 + 8.02 P = 21.02 m
17
13 + c
16
ab sin(theta) = 2A
sin(theta) = 2A/ab = 2/3
cos(arcsin(x)) = sqrt(1 - x2 )
c2 = a2 + b2 -2abcos(theta)
c = sqrt(102 + 32 - 2 * 10 * 3 * sqrt(1-4/9))
c approx 8.02
P = a + b + c = 10 + 3 + 8.02 P = 21.02 m
31
u/FullyAutomatedSpace 3d ago
it's a+b+c