perhatikan gambar berikut. hitunglah keliling dan luasnya

K=2 x (18+5) + 2 x (18+5) + 2 x (8+6)
= 2 x 23 + 2 x 23 + 2 x 14
=46 + 46 + 28
=120 cm

L= 18 x 5 + 18 x 5 + 8 x 6
=90+90+48
=228 cm2

Bangun 1 dan 3
Luas = 2×( p x l) = 2× (18 × 5)
= 180cm^2
Kll = 4× (18 + 5) = 92cm

Bangun 2
Luas = 8×6 = 48cm^2
Kll = 2×(8+6) = 28cm

Luas total = 180 + 48 = 228cm^2
Kll total = 92+ 28 = 120cm