$\"\"$

From the diagram adjacent side = 10, and the angle $\"\"$ .

The measure of the adjacent side is 10. The side with the missing length is

opposite side to the measuring $\"\"$ .

The trigonometric function relating the adjacent side of a right triangle and

the opposite side is the tangent function. $\"\"$

$\"\"$ (Apply Tangent ratio)

$\"\"$ (Substitute $\"\"$ and adjacent side = 10)

$\"\"$ ( $\"\"$ )

$\"\"$ (Multiply each side by 10) \ \

$\"\"$

The value of $\"\"$ .