Question
. The shorter leg of a right triangle is 8 less than the hypotenu se. The longer leg is 1 less than the hypotenu ise. Find the perimeter of the triangle
Solution
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(206 Votos)
Iara
Especialista · Tutor por 3 anos
Resposta
Let's denote the hypotenuse of the right triangle as "h". According to the problem, the shorter leg is "h - 8" and the longer leg is "h - 1".Using the Pythagorean theorem, we can write the equation:(h - 8)^2 + (h - 1)^2 = h^2Expanding and simplifying the equation:h^2 - 16h + 64 + h^2 - 2h + 1 = h^22h^2 - 18h + 65 = h^2h^2 - 18h + 65 = 0Now, we can solve this quadratic equation to find the value of "h":h = [18 ± sqrt(18^2 - 4 * 65)] / 2h = [18 ± sqrt( 260)] / 2h = [18 ± sqrt(64)] / 2h = [18 ± 8] / 2So, we have two possible values for "h":h = (18 + 8) / 2 = 13h = (18 - 8) / 2 = 5Since the hypotenuse of a triangle must be the longest side, we discard the value h = 5.Therefore, the hypotenuse of the triangle is 13 units. The shorter leg is 13 - 8 = 5 units, and the longer leg is 13 - 1 = 12 units.The perimeter of the triangle is the sum of all its sides:Perimeter = 13 + 5 + 12 = 30 units.