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The perimeter of a right triangle is 60 cm. Its hypotenuse is 25 cm. Find the area of the triangle.

The perimeter of a right triangle is 60 cm. Its hypotenuse is 25 cm. Find the area of the triangle.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
2 years ago
In a Right-angled triangle ,the square of the hypotenuse side is equal to the sum of the other two sides and the area of the triangle is half of its product of base and Height. Let, ABC be the given right angled triangle such that base =BC=x cm and hypotenuse AC=25cm . Perimeter is given to us as 60cm . Then, AB+BC+AC=60⇒AB+x+25=60⇒AB=35−x By Pythagoras theorem, we know that, AB2+BC2=AC2⇒(35−x)2+x2=252⇒1225+x2−70x+x2=625⇒2x2−70x+600=0⇒x2−35x+300=0⇒x2−(15+20)x+300=0⇒x2−15x−20x+300=0⇒x(x−15)−20(x−15)=0⇒(x−20)(x−15)=0⇒x=15,20 If, x=20 then AB=35−x=35−20=15 and BC=x=20 . Area of a triangle can be calculated by 12(base×height) so, 12(BC×AB)=12(15×20)=150cm2 . Note: Pythagoras theorem is only applicable for right angle triangles.

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