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how can a right angled triangle be made with a perimeter of 24 cm?

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feed-me-pi | Student, Grade 9 | (Level 1) eNoter

Posted May 8, 2012 at 9:28 AM via web

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how can a right angled triangle be made with a perimeter of 24 cm?

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embizze | High School Teacher | (Level 1) Educator Emeritus

Posted May 8, 2012 at 10:43 AM (Answer #1)

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Since the perimeter is an integer, we are looking for a pythagorean triple whose sum is 24.

The most used triples (at least in textbooks) are 3-4-5, 5-12-13, 8-15-17, and 7-24-25. None of these sum to 24, but 3-4-5 sums to 12.

A triangle formed by the lengths 6-8-10 will also be a right triangle. This triangle is similar to the 3-4-5 triangle by SSS similarity. Or you could use the converse of the pythagorean theorem -- if the square of the longest side of a triangle equals the sum of the squares of the remaining sides then the triangle is right.

Thus the solution is a triangle with sides 6,8, and 10.

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