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The area of a triangle is 381 . Two of the side lengths are 10 and 93 and the included angle is acute. Find the measure of the included angle, to the nearest tenth of a degree.
Answer:

The area of a triangle is 381381 . Two of the side lengths are 1010 and 9393 and the included angle is acute. Find the measure of the included angle, to the nearest tenth of a degree.\newlineAnswer:

Full solution

Q. The area of a triangle is 381381 . Two of the side lengths are 1010 and 9393 and the included angle is acute. Find the measure of the included angle, to the nearest tenth of a degree.\newlineAnswer:
  1. Area Formula Explanation: The area of a triangle can be calculated using the formula:\newlineArea = (1/2)×a×b×sin(C)(1/2) \times a \times b \times \sin(C)\newlinewhere aa and bb are the lengths of two sides, and CC is the included angle between those sides. We are given that the area is 381381, and the side lengths are 1010 and 9393. Let's denote the included angle as θ\theta.
  2. Rearranging Formula: We can rearrange the formula to solve for sin(θ)\sin(\theta):sin(θ)=2×Areaa×b\sin(\theta) = \frac{2 \times \text{Area}}{a \times b}Plugging in the given values, we get:sin(θ)=2×38110×93\sin(\theta) = \frac{2 \times 381}{10 \times 93}
  3. Calculate sin(θ):\sin(\theta): Now, let's calculate the value:\newlinesin(θ)=762930\sin(\theta) = \frac{762}{930}\newlinesin(θ)=0.8193548387\sin(\theta) = 0.8193548387
  4. Find Angle θ\theta: To find the angle θ\theta, we need to take the inverse sine (arcsin) of the value we calculated:\newlineθ=arcsin(0.8193548387)\theta = \arcsin(0.8193548387)
  5. Calculate Angle θ\theta: Using a calculator to find the value of θ\theta to the nearest tenth of a degree, we get:\newlineθ55.1\theta \approx 55.1^\circ

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