Recall the secant-tangent theorem, and you have
EA^2 = EC*CD
12^2 = 8*(x+10)
and now ED = EC+CD = 8+x+10
I suspect a typo somewhere in the murk above
Answer:
x = 84
Step-by-step explanation:
If you add up all of the internal angles in ANY pentagon it will be 540, so
x = 540 - (131+108+107+110)
What is the situation from the problem
542 beacuse 142+400
4+1=5 4+0=a 2+0=2