TIP
Tangent always form angle 90 degree
To solve Right angle-triangle
RECALL
pythagoras theroem
[tex]\begin{gathered} \text{HYP}^2=OP\P^2+ADJ^2 \\ 25^2=15^2+x^2 \\ x^2=25^2-15^2 \\ x^2=625-225 \\ x^2=400 \\ x=\sqrt[]{400} \\ x=20\text{ units} \end{gathered}[/tex]
