15 points :) include steps please use trigonometry to find the measure of the arc cut off by a chord 12 cm long in a circle of radius 10 cm

Step-by-step explanation:

We want to find the red arc at the top of this circle of radius 10.  we draw in two 10 cm radii to the ends of the 12 cm chord  We need to find angle , which subtends the red arc. We use the law of cosines, with our calculator in radian mode. If you haven't had the law of cosines yet, we can do it by considering two right triangles. Post again if you need us to do it that way.   We use the arc length formula: 

I truly don't know if this answer is correct. I am an 8th grader. Haven't learnt this yet but I am really excited to. I found this on the web.

Hope it helped and it is correct

nlgqer

step-by-step

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870