It is the perimeter of a triangle times the length of the prism (in square units).
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Using Pythagoras' theorem the height of the equilateral triangle works out as about 7 cm and so with the given dimensions it would appear to be quite difficult to work out the lateral area.
An right equilateral triangular prism.
No
No. In an equilateral triangle, all three angles are the same. Since they are not ninety degrees, you can't have a right triangle that is also an equilateral triangle.
no. an equilateral triangle is also equiangular, so the angles are 60 degrees each. a right triangle cannot be equilateral