Find missing side and find perimeter 
Brainiest to first of answer 
                                             
                                          
                                          
                                        
											 
											Answer:
10-4=6
12-8=4
6²+4²=x²
36+16=x²
X=√52
X=7.211102550927
perimeter=12+4+10+8+7.211102550927
=41.21110255092
(round it as possible)