Question 829358
An isosceles triangle has two equal sides.  In a right triangle, a^2 + b^2 = c^2.  We're given c^2 (the hypotenuse) as 98cm.  Because it's an isosceles, we know that a & b are the same length.

Here's our equation:
a^2 + b^2 = 98
Since they are equal, it becomes:
2a^2 = 98
Divide each side by 2:
a^2 = 49
Take the square root of each side:
a = 7
If a = 7, then b = 7.  
Your sides are 7, 7, and (square root of 98, or 9.9, but your teacher likely wants you to write it as the square root of 98)