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This is the isosceles triangle. Therefore, the angles at the base are congruent.
We know that the sum of the measures of the angles in a triangle is 180°.
Therefore we have the equation:
<em>subtract 38 from both sides</em>
<em>divide both sides by 2</em>
Alright so
Surface area = (width x height) + (length x width) + (length x height) + (length x side)
Surface area = (width x height) + (length x width) + (length x height) + (length x side)