An angle measures 3pi/4 radians.
what is this angle's measure, in degrees?

135°

Step-by-step explanation:

To convert from radian measure to degree measure

degree measure = radian measure × , so

degree = ×

Cancel π on numerator/denominator and 4, 180 by 4, leaving

degree = 3 × 45 = 135°

1 radian = 180 / PI degrees

3 PI / 4 radians * 180 / PI the "PI's" cancel and we get

3 / 4 * 180 = 135 degrees

Step-by-step explanation:

( ͡° ͜ʖ ͡° ) copy and   paste it

step-by-step explanation:

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.