What is the perimeter of δabc? a)√179 b) √89 + 5 c)√183 + 8√10 d) √34 + √65 + 5

D) √34 + √65 + 5

Step-by-step explanation:

DISTANCE FORMULA: d = √[(x₁ - x₂)² + (y₁ - y₂)²]

length of CA = √(4 - 1)² + (5 - 1)² = √9 + 16 = √25 = 5

length of AB = √(9 - 1)² + (2 - 1)² = √64 + 1 = √65

length of BC = √(9 - 4)² + (2 - 5)² = √25 + 9 = √34

Add up: √34 + √65 + 5

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°