Solve this trigonometry?

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1 Answer
Jan 6, 2018

0.64 cm

Explanation:

Let the middle point be O

Apply Pythagoras theorem in one of the triangles.

In Delta AOM,
AO = 6cm
OM = 2cm
AM = BM = hypotenuse = x (say)

:. x^2 = 36 + 4 = 40

x = 2sqrt10
So, AM + BM = 4sqrt10 ~~ 12.64cm

12.64 cm is the length of stretched string.

:. extended length = stretched length - unstretched length

=> 12.64 - 12 = 0.64cm

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