How do you find the complement and supplement of #(3pi)/4#? Trigonometry Graphing Trigonometric Functions Applications of Radian Measure 1 Answer Dean R. Apr 18, 2018 Complementary angles add up to #pi/2# aka #90^\circ# so the complement of #frac{3pi}{4}# is #pi/2 - frac{3pi}{4}= -pi/4#. Supplementary angles add to #pi# aka #180^\circ# so the supplement of #frac{3pi}{4}# is #pi - frac{3pi}{4 } = pi/4#. Answer link Related questions What are some applications of using radian measure? How do you calculate the length of an arc and the area of a sector? How do you approximate the length of a chord given the central angle and radius? What are some example problems involving angular speed? How do you find the length of the chord of a circle with radius 8 cm and a central angle of #110^@#? How does #sinx=0# equals π? How do you write the function in terms of the cofunction of a complementary angle #tan(pi/5)#? What is the value of #sin(pi/4)#? What is the value of #tan(pi/3)#? What is the value of #cos(7pi/4)#? See all questions in Applications of Radian Measure Impact of this question 8686 views around the world You can reuse this answer Creative Commons License