shayanreloaded
If a2 + b2 + c2 = 250 and ab + bc + ca = 3, then a + b + c is
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WAHEEDAHMED
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shayan use here the formula of (a+b+c)^2 this would help
asnaseer
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follow suggestion by waheedahmed and answer should become abvious
shayanreloaded
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thanks a lot 16 ans
shayanreloaded
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or -16?
shayanreloaded
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Area of triangle, having sides as 8, 11 and the perimeter 32 is
ezhyl_marie
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(a + b + c)^2= a^2 + b^2 + c^2 + 2(ab + bc + ca),
since, a^2 + b^2 + c^2 = 250 and ab + bc + ca = 3,
(a + b + c)^2 = 250 + 2(3)
= 256
= 16^2
therefore: a + b + c = 16 ,.
shayanreloaded
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why not -16?
shayanreloaded
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Area of triangle, having sides as 8, 11 and the perimeter 32 is
WAHEEDAHMED
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area is always taken positive shayanreloaded thats why...
shayanreloaded
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lol these are 2 dif qs
WAHEEDAHMED
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i have given u the answer of above shayan
WAHEEDAHMED
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not the second one
shayanreloaded
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for first -16 is possible right?
and help wid 2nd
WAHEEDAHMED
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you had asked why not -16 for that
WAHEEDAHMED
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no area cant be -16 shayan
shayanreloaded
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this is fr 1st question which is not bout area
WAHEEDAHMED
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ok my mistake both 16 and -16 are possible sorry about that shayan ...i hope u would understand
shayanreloaded
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yeah i do
now 2nd ques
lol
WAHEEDAHMED
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do you know the formula for perimeter shayan the solution is in it
shayanreloaded
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hm
add sides?
shayanreloaded
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3rd side is 13 i dont think i rem. herons formula
WAHEEDAHMED
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after getting third side u will find s=a+b+c/2
shayanreloaded
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16 ok
Siddharth18
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16 is the answer
WAHEEDAHMED
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now use this A=squareroot(s(s-a)(s-b)(s-c)
WAHEEDAHMED
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did u get the answer shayan
shayanreloaded
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43.8?