Question

Solve the triangle. Round to the nearest tenth. B = 81°, a = 4.7, c = 6.8 A = 37.55 C = 62 b = 7.6 Draw a triangle labeling angles A, B, and C, and their corresponding opposite sides a, b, and c. Using the Law of Cosines, which form solves for the measure of angle A? Use the inverse cosine function on the calculator to find angle A in degrees. Additional Materials eBook Law of Cosines 

          Solve the triangle. Round to the nearest tenth.
B = 81°, a = 4.7, c = 6.8
A = 37.55
C = 62
b = 7.6
Draw a triangle labeling angles A, B, and C, and their corresponding opposite sides a, b, and c. Using the Law of Cosines, which form solves for the measure of angle A? Use the inverse cosine function on the calculator to find angle A in degrees.
Additional Materials
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Law of Cosines
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Solve the triangle. Round to the nearest tenth. B = 81°, a = 4.7, c = 6.8 A = 37.55 C = 62 b = 7.6 Draw a triangle labeling angles A, B, and C, and their corresponding opposite sides a, b, and c. Using the Law of Cosines, which form solves for the measure of angle A? Use the inverse cosine function on the calculator to find angle A in degrees. Additional Materials eBook Law of Cosines

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Introductory and Intermediate Algebra for College Students 4th
Introductory and Intermediate Algebra for College Students 4th
Robert Blitzer 4th Edition
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I need help finding angle A and C!! Solve the triangle. Round to the nearest tenth: B = 81, a = 4.7, c = 6.8, A = 37.55°, C = 62°, b = 7.6. Draw a triangle labeling angles A, B, and C, and their corresponding opposite sides a, b, and c. Using the Law of Cosines, which formula solves for the measure of angle A? Use the inverse cosine function on the calculator to find angle A in degrees. Additional Materials: Book - Law of Cosines
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Transcript

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00:01 Okay for this problem we are giving we are given the measures of two angles of a triangle and one side and we're supposed to use the law of sines to solve it the first thing we've got two angles and we know that the three angles add up to 180 so if i will add 38 and 71 and then subtract it from 180 8 plus 1 is 9 and that's 109 and 180 minus 109 is 71 so b is also 71 degrees okay, make sure your calculator is in the degree mode because if it's in radians you're gonna miss this we're gonna set up and actually we can we can get by this is an isosceles triangle because we've got two angles the same.
01:06 All right, so we'll call that c and this b and a since you've got two angles the same these opposite sides are also congruent and this is you know across from angle b if you go out that side b and from angle c if you go out this is side c so this is side a if i know that b is 18 and this is an isosceles triangle i also know that c is 18 because b and c are the angles are congruent and that means the sides are also congruent so i'm gonna set up now.
01:51 We're gonna use the law of sines so i'm gonna say sine and it doesn't matter whether i'm doing b or c i'm gonna say sine of 71 over 18 so let's just say we're using c sine 71 over 18 equals sine, okay.
02:13 What side am i looking for? i'm looking for a so i'm gonna put angle a here and that's little a which is the side a cross multiply and you get sine 71 times a equals 18 times sine 38...
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