Panjang busur AF = panjang busur CD (AF = CD)
AF = 1 × π × d
2
= 1 × 22 × 17,5 cm
2 7
= 27,5 cm
Keliling bangun
= AB + BC + CD + DE + EF + AF
= 40 + 17,5 + 27,5 + 40 + 17,5 + 27,5
= 170 cm
Panjang busur AF = panjang busur CD (AF = CD)