You can put this solution on YOUR website! Pythagorean Theorem. Since we have an isosceles triangle, we know that the two sides that are equal are the legs, while the hypotenuse is 2.
a^2 + b^2 = 2^2
a^2 + a^2 = 4
2a^2 = 4
a^2 = 2
a = sqrt(2) <--- base and height
A = (1/2) b * h
A = (1/2) * sqrt(2) * sqrt(2) = 1/2 * 2 = 1