BC=30-20=10
Triangle rectangle BAI bi²=ab²-ai² BI²=5²+3² BI²=25-9 BI²= 34 BI =rac(34)
Triangle rectangle IHG IG²=IH²+IG² +12²+20²+144+400+544 IG=rac(544)
EF=15-9 =6
Triangle rectangle EFG EG²=EH²+GH² =10²+6²= 100+36=136 EG=rac(136)
Triangle rectangle CDE CE²=CD²+ED²=15²+9²+225+81+306 CE= rac(306)
P= 10+rac(34)+rac(544+rac(136)+rac(306)
P= 10+rac(34)+rac(2^^5*17) +rac(2^3*17)+rac(2*3^^2*17)
P= 10+ rac(34) +4rac(34)+2rac(34)+3rac(34)
P=10+rac(34)[1+4+2+3]
P=10+10rac(34)
P= 10+10(5.83)
P=10+58.3) P= 68.3