tolong dibantu ya...terimakasih

L = axtx1/2
66= ax12x1/2
66=ax6
11 = a

A-B = alas = 11
BC = √5²+12² =√25+144 = √169 =13
AC = √16²+12² = √256+144 =√400 = 20
Keliling = tambah semua sisinya
= 11+13+20 = 44 cm