$\ (D_{10}, \leqslant)$ is a lattice. Draw its Hass's Diagram.

We have $\ D_{10} = [1,2,5,10]$

The Hasse diagram is shown in

To show that $\ (D_{10}, \leqslant)$ = [1,2,5,10] are lattice. Now find 'V' & '^'

From the two table, we observe that every pair of element $\ D_{10}$ has LUB (least upper bound) and GLB (greatest upper bound). Hence ($\ (D_{10}, \leqslant)$) is a lattice.