Help my homework pls.​

1) He measured an octagon

2) 89°

Step-by-step explanation:

All other conventional shapes are less than 900°. An octagon is 1080°. To find missing angle you

3x3 = 9 and 2x2 = 4

step-by-step explanation:

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18