If the arithmetic pattern shown continues, what will be the 8th number?

54, 48, 42, 36,

Each time, you are subtracting 6 to get to the next term. The 8th term would be 12.

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

do you have a picture of the table