the correct answer would be - 3.25cm
here its given that x=4cm , y=4cm and z=13cm.
What are Trigonometric identities ?
Trigonometric identities are equations involving the Trigonometric functions that are true for every value of variables involved.
The question would be solved by applying trigonometry here, Hence, applying trigonometric identity of cos0 which is base upon hypotenuse i.e. B/H
here, a triangle would be constructed wherein, base would be z=13cm
and x and y will define the other 2 lines of 4 cm each and applying cos0=base/hypotenuse , here we get 13/4= 3.25cm.
hence the correct answer is- 3.25cm
learn more about" lines and angles" here
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