Q. 64.2( 14 Votes )

A 15 m long ladde

Answer :

Let BC be the length of ladder i.e. 15 cm and the height of the window from the ground be AB i.e. 12 cm.

We know that in a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

In ΔABC, BC2 = AB2 + AC2

152 = 122 + x2

225 = 144 + x2

x2 = 225 – 144 = 81

x = √81 = 9 cm

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