hitung panjang busur dan luas juring 30°

1.
[tex]panjang busur = \frac{30}{360} \times 40 \times 3.14[/tex]
[tex] \frac{1}{12} \times 40 \times 3.14[/tex]

= 10,467

2.
[tex] luasjuring = 20 \times 20 \times 3.14 \times \frac{30}{360} [/tex]
= 104,67

semoga membantu