An isosceles triangle is one where two sides have the same length and the third side has a possibly different length. Suppose you have an isosceles triangle where two sides have length $a$ and the base has length $b$. Then the height of that triangle is $h=$ .
The area of your triangle is $A=$ .
Hint: Draw the right triangle and its height. Apply the Pythagorean Theorem. Use $sqrt(...)$ to enter the square root of something. The area of a triangle is one half times base times height.