The perimeter of a right triangle is 40 cm and its hypotenuse measures 17 cm. Find the area of the triangle.

Given: Perimeter = 40 cm


Hypotenuse = 17 cm


The diagram is given as:



Let the sides be a, b and c(hypotenuse).


Therefore, a + b + c = 40 cm


a + b + 17 = 40 cm


a + b = 40 - 17 cm


a + b = 23 cm


a = (23-b) cm


Now we know that,


Base2 + Perpendicular2 = Hypotenuse2


a2 + b2 = c2


(23-b)2 + b2 = 172


232 + b2-46b + b2 = 289


529 + b2-46b + b2 = 289


2b2-46b + 240 = 0


b2-23b + 120 = 0


b2-8b-15b + 120 = 0


b(b-8)-15(b-8) = 0


(b-8)(b-15) = 0


This gives us two equations,


i. b-8 = 0


b = 8


ii. b-15 = 0


b = 15


Let b = 8 cm


a = (23-b) cm


a = (23-8) cm


a = 15 cm


Now,


Area of triangle = 1/2 × base × height


= 1/2 × 8 × 15


= 60 cm2


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