This is easy and im getting this wrong...

The triangle is a right-angled triangle.

Radius of circumcircle = 26/2 = 13

Area of circumcircle = $\pi \cdot 13^2 = 169\pi$

Radius of incircle = $\dfrac{2\times\text{Area}}{\text{Perimeter}} = 4$

Area of incircle = $\pi \cdot 4^2 = 16\pi$

Therefore $a - b = 169\pi - 16\pi = 153\pi$

Because this is a right triangle (10² + 24²  =  26²), the center of the circumcircle is the midpoint of the

hypotenuse. This means that the radius of the circumcircle = 26/2  =  13.

Because this is a right triangle, the radius of the incircle can be found using this formula:

   r  =  ( a + b - c ) / 2           where c is the hypotenuse and a and b are the other two sides.

From these radii, you can calculate the areas.