perhatikan gambar disamping! keliling bangun ABCDE adalah

Dik :

Persegi panjang
- panjang = 15 cm
- lebar = 10 cm

Segitiga
- sisi miring = 15 cm
- alas = 9 cm
- tinggi = 15^2 - 9^2 =
[tex] = \sqrt{225 - 81} \\ = \sqrt{144} \\ = 12 \: cm[/tex]

Jawab :

Keliling = [2 (p + l)] + (s + s + s)
= [ 2 (15 + 10)] + (9 + 12 + 15)
= (2 × 25 ) + 36
= 50 cm + 36 cm
= 86 cm