sum of lenght , breadth and height of a cuboid is 19 cm and diagonal is 5×root 5. Find its surface area
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It's Surface Area = 356 cm square.
PritamMitra:
but how
Sry mene wrong ans diya
its ok
236cm square is right answer
bit how
We know that, a+b+c = 19 And 5root5= under the root a^2+b^2+c^2 so from squaring both side we get 125=a^2+b^2+c^2 now (a+b+c)^2 =19^2 that is 361
And from identity (a+b+c)^2 = a^2+b^2+c^2 +2ab+2bc+ca
361=125+2(ab+bc+ca) , 2(ab+bc+ca) =361-125=236 . That is equal to the surface area of cuboid
now plzz mark it as brainliest
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