We are already given with the function to solve for the area: <span>A(θ) = 16 sin θ ⋅ (cos θ + 1) </span> We simply have to substitute the value of the angle into the function. So, If <span>θ = 90°, A(</span>90°) = 16 sin (90°) ( cos (<span>90°) + 1 )
Using the calculator or the definition of trigonometric functions at angle of </span><span>90°, we get the value of the area: </span>A(<span>90°) = 16 square inches</span>
