Please help! (Geometry)

x=5

From the dashed lines on the two sides of this triangle, we can see that these two sides are congruent, or equal, to each other.

In geometry, if a triangle has two congruent sides, then we can call it a isosceles triangle.

In an isosceles triangle, the corners  opposite the congruent  sides  are also congruent, meaning, that the angle measures of this triangle are: 88, 9x+1, and 9x+1.

We also know that angles in a triangle add up to 180 degrees.

So, we have: 88+(9x+1)+(9x+1) = 180

Simplifying: 18x + 2 = 92

Solving: 18x = 90, so x=5

Hope this helps!

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°

multiply each one by 3.14

step-by-step explanation: