Question

find the unit measure of ADI need help with this

Answer 1

From properties of lines inscribed in circles we will have that:

$\begin{gathered} AD+DB=AB:AD=DB \\ \\ \Rightarrow2AD=AB\Rightarrow AD=\frac{AB}{2} \\ \\ \Rightarrow AD=\frac{60}{2}\Rightarrow AD=30 \end{gathered}$

So, the measure of AD is 30 units.