A right triangle with coordinates A(−1, 4), B(−1, 8) and C(3, 4) is first rotated 90 degrees counterclockwise and then translated 2 units left and 3 units down to form triangle A'B'C'. What is the measure of angle B'A'C', in degrees, in the resulting figure?

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

the answer is 13/48

step-by-step explanation: