An archaeologist discovers a piece of a ceramic plate. She knows that if the plate is from the third century it was probably a regular 16-gon, but if it was from the twelfth century it was probably a regular 18-gon. If one of the angles on the piece she found is 160o , from which century did the plate most likely originate? Why?

29.5977692753

step-by-step explanation:

the first one

step-by-step explanation:

just id the test.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

p

step-by-step explanation: