Who was the first one to use algebra to solve geometric problems?

Answer 1

Amongst many others Pythagoras was one of them with his famous theorem for a right angle triangle of: a2+b2 = c2 whereas a and b are the sides of the triangle with c being its hypotenuse or longest side

Answer 2

The ancient Greek mathematician, Euclid, is often credited as the first to use algebraic techniques to solve geometric problems. His work in his renowned mathematical work "Elements" laid the foundation for the use of algebra in geometry.