Answer:
The legs of this triangle are both 3cm.
Step-by-step explanation:
Since this triangle is isosceles, the two unknown sides have the same length. Use Pythagorean Theorem because it is a right triangle. See image.
They are similar in that you can only combine like terms. They differ in that when you simplify complex numbers, since i² = -1, there are only two types of terms; the real part and the imaginary part. In a polynomial, different powers of the variable are distinct. The field axioms are the same for complex numbers and polynomials.