Answer:
XY=8.2 cm
Explanation:
The attached figure shows a triangle XYZ. It is right angle at vertex Y and XZ = 24 cm. Also, angle ZXY = 70°
We need to find the length of line segment XY. It can be calculated using Trigonometry. So,

So, the length of the line segment XY is 8.2 cm. Hence, the correct option is (a) "8.2 cm".