Mathematics, 01.03.2020 23:43 kwilly60
Complete the proof of the Law of Sines/Cosines.
Triangle ABC with side b between points A and C, side c between points A and B. Segment drawn from point A to point D where D is between points B and C, segment AD is labeled x.
Given triangle ABC with altitude segment AD labeled x. Angles ADB and CDA are _1._ by the definition of altitudes, making triangle ABD and triangle CDA right triangles. Using the trigonometric ratios sine of B equals x over c and sine of C equals x over b. Multiplying to isolate x in both equations gives x = _2._ and x = b β
sinC. We also know that x = x by the reflexive property. By the substitution property, _3._. Dividing each side of the equation by bc gives: sine of B over b equals sine of C over c.
A)
1. altitudes
2. b β
sinB
3. b β
sinB = c β
sinC
B)
1. right angles
2. b β
sinB
3. b β
sinB =c β
sinB
C)
1. altitudes
2. c β
sinB
3. c β
sinB = b β
sinC
D)
1. right angles
2. c β
sinB
3. c β
sinB = b β
sinC
Answers: 2
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Complete the proof of the Law of Sines/Cosines.
Triangle ABC with side b between points...
Triangle ABC with side b between points...
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