Question

Find the value of x please

Answer 1

when running a line, in a right-triangle, from the 90° angle perpendicular to its opposite side, we will end up with three similar triangles, one Small, one Medium and a containing Large one. Check the picture below.

`\cfrac{x}{7}~~ = ~~\cfrac{10}{x}\implies x^2=70\implies x=√(70)`