Suppose that {{MATH_259}}. Compute {{MATH_260}}. {{CMD_261}} If {{MATH_262}}, then {{ENV_263}} Now we will use the Pythagorean Theorem to deduce {{MATH_264}}. If {{MATH_265}}, the triangle in question must be similar to this triangle: {{CMD_266}} {{ENV_267}} {{CMD_268}} From this triangle and our work above, we see that {{MATH_269}} {{CMD_270}} {{CMD_271}}