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The area of a parallelogram is 10 , and the lengths of its sides are 6.9 and 6.7 . Determine, to the nearest tenth of a degree, the measure of the acute angle of the parallelogram.
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The area of a parallelogram is 1010 , and the lengths of its sides are 66.99 and 66.77 . Determine, to the nearest tenth of a degree, the measure of the acute angle of the parallelogram.\newlineAnswer:

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Q. The area of a parallelogram is 1010 , and the lengths of its sides are 66.99 and 66.77 . Determine, to the nearest tenth of a degree, the measure of the acute angle of the parallelogram.\newlineAnswer:
  1. Area Formula: The area of a parallelogram is given by the formula A=b×hA = b \times h, where AA is the area, bb is the base, and hh is the height. The height is the perpendicular distance from the base to the opposite side, which can also be expressed as h=b×sin(θ)h = b \times \sin(\theta), where θ\theta is the angle between the base and the side adjacent to the base.
  2. Choosing Base: We are given the area A=10A = 10 and the lengths of the sides, but we do not know which side should be considered the base. Since the formula for the area does not change with the choice of base and height as long as they are perpendicular, we can choose either side as the base. Let's choose the longer side, 6.96.9, as the base for convenience.
  3. Height Calculation: Now we can express the height hh in terms of the angle θ\theta and the base bb. We have h=6.9×sin(θ)h = 6.9 \times \sin(\theta). We can substitute this into the area formula to get 10=6.9×h=6.9×6.9×sin(θ)10 = 6.9 \times h = 6.9 \times 6.9 \times \sin(\theta).
  4. Solving for sin(θ)\sin(\theta): To find sin(θ)\sin(\theta), we rearrange the equation to solve for sin(θ)\sin(\theta): sin(θ)=10(6.9×6.9)\sin(\theta) = \frac{10}{(6.9 \times 6.9)}.
  5. Calculating sin(θ)\sin(\theta): Calculating sin(θ)\sin(\theta), we get sin(θ)=10(6.9×6.9)=1047.610.210\sin(\theta) = \frac{10}{(6.9 \times 6.9)} = \frac{10}{47.61} \approx 0.210.
  6. Finding Angle θ\theta: Now we need to find the angle θ\theta whose sine is approximately 0.2100.210. We use the inverse sine function (also known as arcsin) to find this angle. θ=arcsin(0.210)\theta = \arcsin(0.210).
  7. Final Angle Calculation: Using a calculator, we find that θarcsin(0.210)12.1\theta \approx \arcsin(0.210) \approx 12.1 degrees. Since we are looking for the acute angle and the arcsin function returns the acute angle, this is the angle we are looking for.

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