Question

the sum of Length breadth and depth of a cuboid is 19 CM and the length of diagonal is 11 centimetre find the surface area of cuboid.
please.. Who will give me the answer .I will mark as brainliest.....

Answer 1

Answer:

Surface area of the cuboid 240 square cm.

Step-by-step explanation:

Formula used:

Surface area of cuboid = 2(lb+bh+hl) square units

Length of the diagonal of cuboid$=\sqrt{l^2+b^2+h^2}$

$(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)$

Given:

l+b+h= 19 cm

Also

Length of diagonal = 11 cm

$\sqrt{l^2+b^2+h^2}=11$

squaring on both sides

$l^2+b^2+h^2 = 121$

$Now\\\\(l+b+h)^2=l^2+b^2+h^2+2(lb+bh+hl)\\\\19^2=121+2(lb+bh+hl)\\\\361-121=2(lb+bh+hl)\\\\2(lb+bh+hl)=240\\\\surface\:area=240\:cm^2$

Answer 2

Answer:240cm2

Step-by-step explanation:

Length is 7cm

Breadth is 6 cm

Height is 6 cm

L2+B2+H2=121 square both sides

Find tsa

Simple....