Two angles are if and only if the sum of their measures is 90°. a. adjacent angles b. vertical angles c. complementary angles d. right angles

the answer is c

Step-by-step explanation:

90 degree angles are complamentary

d

gimmee one of those gold crowns!

~coco

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°