Q. 24.3( 19 Votes )

In the right angled ΔXYZ, XYZ = 900 and a,b,c are the lengths of the sides as shown in the figure. Write the following ratios,

(i) sin X (ii) tan Z

(iii) cos X (iv) tan X.

Answer :

For any right-angled triangle,

sinθ = Opposite side Side/Hypotenuse

cosθ = Adjacent Side/Hypotenuse

tanθ = sinθ/cosθ

= Opposite Side/Adjacent Side

In the given triangle let us understand, the Opposite side and Adjacent side

So for X,

Opposite Side = YZ = a

Adjacent Side = XY = b

So for Z,

Opposite  Side = XY = b

Adjacent Side = YZ = a

In general for the side Opposite side to the 90° angle is the hypotenuse.

So for Δ XYZ, hypotenuse = XZ = c

(i) sin X = Opposite side Side/Hypotenuse


= a/c

(ii) tan Z = sinθ/cosθ

= Opposite  Side/Adjacent Side


= b/a

(iii) cos X= Adjacent  Side/Hypotenuse


= b/c

(iv) tan X = sinθ/cosθ

= Opposite  Side/Adjacent Side


= a/b

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