the sum of l , b,and h of the cubiod is 19cm and it's diagonal is 15cm . the total surface area of the cubiod is ?
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l+b+h=19
(l+b+h)^2=19^2
l2+b2+h2+2(lb+bh+hl)=19^2
2(lb+bh+hl)=361-15^2 (l2+b2+h2=15^2)
so TSA=361-225=136 square cm
(l+b+h)^2=19^2
l2+b2+h2+2(lb+bh+hl)=19^2
2(lb+bh+hl)=361-15^2 (l2+b2+h2=15^2)
so TSA=361-225=136 square cm
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