Question

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Answer 1

Hence Cos X = 40/41 .

Explanation:

Given- X Y = 41 units, Y Z = 9 units, X Z = 40 units, ∠ Z= 90°,

∵ ∠ Z = 90°, so Δ XYZ is a right triangle.

∴ By Pythagorean Theorem-

Cos X =
`(Base)/(Hypotenuse)`

Cos X =
`(X Z)/(X Y)`

Cos X =
`(40)/(41)`