Answer:
77.25 cm^2
Step-by-step explanation:
Area of a regular octagon :
2a^2(1 + (sqrt2))
where a is the side
substitute 4 in for 'a'
Answer:
A)
Step-by-step explanation:
Supplementary angle = 180
180 - 51 = x
x = 129
C) 129 degrees is your answer
hope this helps