The area of a triangle is 2.8 ft2. What is the area of a rectangle with the same length and width? pl help

Answer is in the file below

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cosθ = 0.87

Step-by-step explanation:

Identity given,

sin²θ + cos²θ = 1

Values of sinθ = 0.5

Since, angle θ is in the first quadrant, all values of cosθ and sinθ will be positive.

Therefore, cos²θ = 1 - sin²θ

cos²θ = 1 - (0.5)²

cos²θ = 1 - 0.25

cosθ = √(0.75)

        = 0.86603

        ≈ 0.87

Therefore, value of cosθ will be 0.87