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Menghitung panjang busur AP
∠AEP = 155° → sudut refleksnya = 360° - 155° = 205°
Jadi:
Panjang busur AP = 2 x (205°/360°) x 3.14 x 13 = 46,5 cm
Panjang AR
AR = √(40² - (13-5)²)= 39,2 cm
Panjang busur RQ
Sudut yang menghadap busur RQ = 155°
Panjang busur RQ = 2 (155°/360°) x 3.14 x 5 = 13,5 cm
Dengan demikian:
Panjang tali karet = Panjang busur AP + 2AR + Panjang busur RQ
= 46,5 + 2 x 39,2 + 13,5
= 138,4 cm