Please help me by answering this?
1 answer:
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Imagine 
at the top of the triangle and 
at the bottom. (or used the attached picture for reference)
One thing to note, however, is that the side opposite is the same side as the one adjacent to ! Thus 
.
Substitute these values for
and 
and solve.
One thing to note, however, is that the side opposite
Substitute these values for
The original area of a face would be a^2. Now that you added b to the edge, the new area of each face would be (a+b)^2. To find how much the are increased, subtract a^2 from (a+b)^2. So the answer is b(2a+b)