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Can someone show to me how to do it and also give the answer, I'll be very appreciated. ​

Can someone show to me how to do it and also give the answer, I'll be very appreciated-example-1

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2 votes
40cm is your answer. The reason why is because the surface area is calculated by adding up all of the sides. When you do regular area, you multiply the members to get the total.
User Balajeerc
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