sekalian caranya yaa kak

[tex] \frac{panjang \: busur \: ab}{panjang \: busur \: cd} = \frac{besar \: sudut \: aob}{besar \: sudut\: cod} \\ = \frac{45}{x} = \frac{20}{60} \\ = 20x = 45 \times 60 \\ =x = \frac{45 \times 60}{20} \\ = x = 135[/tex]
jawabannya C