tolong nomor 11 sma 12 ya penting bgt

11) sudut boc = 90-60 = 30
<boc/L boc = <doc/L doc
30/L boc = 60/120
L boc × 60 = 120 × 30
L boc = 360/60
L boc = 60

12) L = 3/4 × πr²
= 3/4 × 3,14 × 10 × 10
= 235,5