Angular animation : Rotation 180° click image

How to make a image rotation (click : 0° -> 180° / click again : 180° -> 0°) on image button with Angular 4 ?

I use Angular Material too.

This is my button :

 <!-- Button open left menubar -->
<button md-icon-button class="left-menubar-button"  (click)="start.toggle()">
  <md-icon class="md-custom-theme-gray">label_outline</md-icon>
</button>

This button will open a sidenav, and I want to animate it to get more userfriendly

Thanks