suppose a trianle hass the side lengths of 42 and 35 and the anle between the two sides is 120 what equation should you use to find the length of the third side

answer to this question is 66.78

If we know two sides and an included angle of any triangle, we can use law of cosines to find the unknown length of the third side

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°