A.B = 7*7 + 7*3 = 49 + 21 = 70
|A| = sqrt(72 + 72) = sqrt(98)
|B| = sqrt(72 + 32) = sqrt(58)
So cos(q) = A.B/(|A|*|B|) = 0.92848
q = cos-1(0.92848) = 0.38 radians (=21.8 degrees).
By the looks of it, x + 7 is a vector of degree one polynomials. An angle are between vectors, not only one. Hence there is no angle. You might as well say 0 since that's the angle with itself.
7
7
A+
7+73" = 80
.7
73
210 degrees
73
There are four pairs of prime integers whose sum is 80. They are: (7, 73) (13, 67) (19, 61) (37, 43)
10.4286
7 side angle