Step-by-step explanation:
m< AOC = 90°
m< AOB +m<BOC = 90°
6x-12+3x +30 = 90°
9x +18° = 90°
9x = 90- 18° = 72°
x = 8°
m<AOB =6(8)-12 = 48-12 = 36°
Answer:


Step-by-step explanation:
By geometric mean property:

The answer 2 your question is 24in
Answer:
70 minutes
Step-by-step explanation:
420/6=70 mins