Select the correct answer. the vertices of a triangle are a(7, 5), b(4, 2), and c(9, 2). what is m`/_abc`?

check the picture below.

now, if we split that triangle like so with that red line, we can use the right-triangle there, to get θ.

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol

the answer is 40.

proof: