Bantu jawab dong!!!!

a. Keliling persegi
= s + s + s + s
= 4 × s
= 4 × 10 cm
= 40 cm

b. Keliling persegi panjang
= 2 × (p + l)
= 2 × (27 cm + 6 cm)
= 2 × (33 cm)
= 66 cm

c. Keliling segitiga
= sisi 1 + sisi 2 + sisi 3
= 10 cm + 9 cm + 8 cm
= 27 cm