No the 2 equal base angles cannot be obtuse because the 3 interior angles of any triangle add up to 180 degrees
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Only if you are dancing on a log in the lost forest.
You write the height. Draw as dashed line segment, which is perpendicular to the base, from the top vertex down to the base (or a dashed line extended from the base for an obtuse triangle). Put a right-angle symbol (small square) where this line segment intersects the base)
The hypotneuse is squared and added to the base
The base angles of an isosceles triangle are congruent. The vertex angle of an isosceles triangle is not necessarily congruent to the base angles.
Area = 0.5*base*altitude