Question

What is dz?

Answer 1

`DZ~~8.15cm(2dp)`.

Explanation:

`DW=radius=10 :. DY=10`.

Now, applying Pythagoras Theorem to the right- `DeltaDZY,`

`DY^2=DZ^2+ZY^2`.

`:. DZ^2=10^2-5.8^2=100-33.64=66.36`.

`:. DZ=sqrt(66.36)~~8.15cm(2dp)`.