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Total Surface Area of a Cuboid

ABCDEFGH is a...

Question

ABCDEFGH is a cuboid. Find EG.

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Solution

In $Δ H E G$
$E G^{2} = H E^{2} + H G^{2}$
$E G^{2} = 4^{2} + 11^{2}$
$E G^{2} = 16 + 121$
$E G^{2} = 137$
$E G = \sqrt{137} = 11.7 c m$

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