To find the decreased percentage,here's what we can do:

In this case,the eqaution would be:

Hope it helps!
Answer:

Step-by-step explanation:
first you take 60°/360°= 1/6 then you take 1/6 and multiple it by
and that equals
finally take
times the radius (6) and that should equal 
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Answer:
The rate at which energy is used is called power.
Step-by-step explanation:
I believe it has 8 angles, each are 135 degrees
sorry if its wrong