And i solosis right triangle is always 45-45 90 triangle

This is true. This is because an isosceles triangle is a triangle that has two congruent/equal sides and two congruent angles. A right triangle is a triangle that has a 90° angle. And a triangle is 180°.

picture below

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24