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Question

The perimeter of a right angled triangle is 72cm and its area is 216cm2. Find the sum of the lengths of its perpendicular sides (in cm).

A
36
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B
32
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C
42
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D
50
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Solution

The correct option is C 42
REF.Image
Perimeter of right triangle = 72
a+b+c= 72 _____________ (1)
its area = 216
12ba=216
ba=432 ___________ (2)
c2=a2+b2 (By pythagoras theorem )
(a+b+c)2=a2+b2+c2+2ab+2bc+2ac
(72)2=c2+c2+2ab+2bc+2ac
5184=2c2+2ab+2bc+2ac
5184=2c2+2ab+2c(b+a)
5184=2c2+2ab+2c(72c)
5184=2c2+2ab+144c2c2
5184=2ab+144c
5184=2×432+144c
c=9320144
c=30
putting c in equation (1)
a+b+c=72
a+b=72-30
a+b=42.

1227050_1503895_ans_c188b518a09844d5a50f956623915888.jpg

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