So this is my first post via phone...yeah for those who know me I am not the techiest person on earth...
For a change I decided to cover a damaged armchair with lovely granny hexagones! You can find a tutorial on granny squares here
Pretty much you do 6 instead of 4 angles. And follow the same technique throughout.
So instead of throwing your armchair away and upholster it all together, you might want to try this cute option and just patch the damaged area...
Enjoy patching & crocheting!