Given that the two squares share a common vertex, the [b][color=#38761d]areas of the green triangles[/color][/b] are equal. [br]([url=https://twitter.com/solvemymaths/status/833212994725228545]Source[/url]) [br][br]This is made evident because both triangles have the same base and [b][color=#9900ff]the same height[/color][/b].