The length of the hypotenuse of a right angle triangle is 240 units . ...
A^2 + b^2 = c^2 = 240^2 = 57600
a + b + 240 > 550
a + b > 310
a > 310 - b
b > 310 - a
first perfect square after 550 is 24^2
which is 576 set a + b + 240 equal to 576
a + b = 336 (576 - 240 = 336)
a = 336 - b
b = 336 - a (use this to subsitute)
a^2 + (336 - a)^2 = 57600
a^2 + 112896 - 672a + a^2 = 57600
(336^2 = 112896, 2*336 = 672)
2a^2 - 672a + 55296 = 0
a^2 - 336a + 27648 = 0
27648 = 2 * 13824
13824 = 2 * 6912
6912 = 2 * 3456
3456 = 2 * 1728 1728 = 2 * 864
864 = 2 * 432 432 = 2 * 216
216 = 2 * 108 108 = 2 * 54
54 = 2 * 27
27 = 3 * 3 * 3
27648 = 2^10 * 3^3 = 1024 * 27
144 = 2^4 * 3^2
27648 = 2^4 * 3^2 * 2^6 * 3 = 16 * 9 * 64 * 3 = 144 * 192
144 + 192 = 336 (a - 192)(a - 144) = 0
a = 144 or a = 192
now b = 336 - a
so b = 192 or b = 144
side a needs to be a minimum of 144, and side b needs to be a minimum of 192
This question is part of UPSC exam. View all CAT courses
The length of the hypotenuse of a right angle triangle is 240 units . ...
Solution:
Given:
- Length of the hypotenuse of a right angle triangle = 240 units
- Perimeter of the triangle is a perfect square
- Perimeter of the triangle > 550 units
To find:
- Length of a side of the right-angled triangle
Analysis:
Let's assume the sides of the right-angled triangle are a, b, and c, where c is the hypotenuse.
According to the Pythagorean theorem, the sum of the squares of the two sides of a right-angled triangle is equal to the square of the hypotenuse.
So, we have:
a^2 + b^2 = c^2 ...(1)
We are given the length of the hypotenuse, which is 240 units. Therefore, we have:
a^2 + b^2 = 240^2 ...(2)
Also, the perimeter of the triangle is the sum of the lengths of its sides:
Perimeter = a + b + c
Since the perimeter is a perfect square, we can write:
Perimeter = k^2 ...(3), where k is a positive integer
Now, we need to find the possible lengths of the sides of the triangle.
Solution:
Let's consider the given options one by one:
a. 192 units:
If one side of the triangle is 192 units, then using equation (2), we have:
192^2 + b^2 = 240^2
Simplifying the equation, we get:
b^2 = 240^2 - 192^2
b^2 = (240 + 192)(240 - 192)
b^2 = 432 * 48
Now, we need to check if the perimeter is greater than 550 units:
Perimeter = a + b + c
Perimeter = 192 + b + 240
Perimeter = 432 + b
Since b is a positive integer, the minimum value of b can be 1.
So, the minimum possible perimeter = 432 + 1 = 433
Since 433 is not a perfect square and it is less than 550, the length of a side cannot be 192 units.
b. 168 units:
If one side of the triangle is 168 units, then using equation (2), we have:
168^2 + b^2 = 240^2
b^2 = 240^2 - 168^2
b^2 = (240 + 168)(240 - 168)
b^2 = 408 * 72
Now, we need to check if the perimeter is greater than 550 units:
Perimeter = a + b + c
Perimeter = 168 + b + 240
Perimeter = 408 + b
Since b is a positive integer, the minimum value of b can be 1.
So, the minimum possible perimeter = 408 + 1 = 409
Since 409 is not a perfect square and it is less than 550, the length of a side cannot be 168 units.
c. 144 units:
If one side of the triangle is 144 units, then using equation (2), we have:
144^2 + b^2 = 240^2
b^2 = 240^2 - 144^
To make sure you are not studying endlessly, EduRev has designed CAT study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in CAT.