kak tolong bantu y. kasih penjelasan y ditail.makasih

Lp = La + (ka x t)
= πr² + (2πrt)
= πr (r+2t)
= 3,14. 5 (5+2.25)
= 3,14. 5 (5+50)
= 3,14.5.55
= 863,5 cm²

Lp 1 : Lp2 = πr (r+2t1) : πr (r+2t2)
= (r+2t1) : (r+2t2)
= (5+2.25): (5+2.20)
= (5+50): (5+40)
= 55 : 45
= 11 : 9