keliling daerah yang diarsir adalah... A. 30 cm² B. 33 cm² C. 36 cm² D. 40 cm²

AB+AF+CF+BC+EF+DE
6+4+3+5+10+8
= 36 cm

BC*2 = 3*2 + 4*2
BC*2 = 9 + 16
BC*2 = 25
BC = √25
BC = 5 cm

DE*2 = 10*2 - 6*2
DE*2 = 100 - 36
DE*2 = 64
DE = √64
DE = 8 cm
Keliling Daerah yg diarsir
K = AB + BC + CD + DE + EF + FA
K = 6 + 5 + 3 + 8 + 10 + 4
K = 36 cm

Jawaban = c. 36 cm