Question

21. The sum of the length, breadth and depth of a cuboid is 20 cm and its diagonal is 4root5 cm. The surface area of cuboid will be A. 320 cm? ​

Answer 1

Answer:

a^2 + b^2 + c^2 = (4 sqrt5)^2 = 80

a+b+c = 20

After squaring ,  

a^2 + b^2 + c^2 + 2ab + 2bc + 2ac = 400

Subtract it

2ab + 2bc + 2ac = 400-80

=320

HOPE THIS IS YOUR ANSWER!!!  （￣︶￣）

Answer 2

Step-by-step explanation:

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