How much fabric is required to cover x buttons in the shape of a circle whose radius is 3x ?

Radius of 1 button = r = 3x

Fabric required to cover 1 button = Area of the circle

=

=

=

Total number of buttons = x

Fabric required to cover 1 button =  

Fabric required to cover x buttons =

Hence, fabric required to cover x buttons  sq. units

step-by-step explanation:

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°