PYTHAGOREAN THEOREM WORD PROBLEMS FOR GRADE 10

Problem 1 :

The hypotenuse of a right triangle is 6 m more than twice of the shortest side. If the third side is 2 m less than the hypotenuse, find the sides of the triangle.

Solution :

Let x be the length of shorter side,

length of hypotenuse  =  2x + 6

length of third side  =  2x + 6 - 2

  =  2x  + 4

(2x + 6)2  =  x2 + (2x + 4)2

4x2 + 24x + 36  =  x2 + 4x2 + 16x + 16

 x2 + 16x - 24x + 16 - 36  =  0

 x2 - 8x  - 20  =  0

(x - 10) (x + 2)  =  0

x  =  10 and x = -2

Hence the length of shorter side is 10

hypotenuse  =  2(10) + 6  =  26

length of third side  =  20 + 4  =  24

AC  =  √342 + 412

   =  √1156 + 1681

  =  √2837

  =  53.26

Miles saved  =  (34 + 41) - 53.26

  =  75 - 53.26

=  21.74 m

Problem 2 :

In the rectangle WXYZ, XY + YZ = 17 cm, and XZ + YW = 26 cm. Calculate the length and breadth of the rectangle?

Solution :

XY + YZ = 17 cm

XZ + YW = 26 cm


To calculate : - Length and breadth of the rectangle.


We know that,

Diagonals of a rectangle are equal.

So,

XZ = YW

Then,

XZ = YW = 26/2 = 13 cm

In ∆XYZ, let YZ = P. Then

XY = 17 - P

Then, by Pythagoras theorem,

(P)2 + (17 - P)2 = (13)2

P2 + 289 - 34P + P= 169

2P2 - 34P = 169 - 289

2(P2 - 17P) = - 120

 P2 - 17P = - 120/2

P2 - 17P = - 60

P2 - 17P + 60 = 0

P2 - 12P - 5P + 60 = 0

 P(P - 12) - 5(P - 12) = 0

(P - 12)(P - 5) = 0

P - 12  =  0  or  P  =  12

P  =  12 cm  or  P  =  5 cm

Now,

YZ = P = 12 cm [Because , YZ is the length of the rectangle ,so we will assign it the greatest value of P]

Again, XY = (17 - P) = (17 - 12) cm = 5 cm

[Because , XY is thee breadth]

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