20 Answered Questions for the topic Law Of Cosines

04/10/18

Triangles using law of cosines?
A triangle with, A=60 degrees, b=6, and c=9. Find B and C. I already found that a= 3 square root of 7.
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03/02/18

See Description
One end of a wire is attached to the top of the tower and the other end to a stake in the ground that is 44’ from the base of the tower. The wire makes a 64 degree angle with the flat ground. If... more
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02/13/18

explain when one should use the law of cosine instead of the law of sine
explain when one should use the law of cosine instead of the law of sine
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05/30/17

Which set of lengths will form a triangle with the greater area?
Using trigonometric methods (law of cosine/sine) or cosine/sine/tangent, determine which set of lengths will form a triangle with the greater area? Show work for both sets.   Set #1) 8 feet, 7... more
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05/22/17

find b. AB= 14 in BC= 8 in b=117 deg
find indicated meaure
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03/12/17

Setting up the trig equation. Using sine or cosine.
Tami and Dustin are on opposite sides of the washington monument, which is 555 feet. Tami's angle of elevation to the top of the monument is 38 degrees. Dustin's angle of elevation is 64 degrees.... more
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01/07/17

Missing Angle
Find the missing angle of each triangle below. Estimate answer to one decimal place.       B        x        x   x A=23        x       x        x          xc=14 x             x C        x        ... more
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01/07/17

Missing Angle
Find the missing angle of each triangle below. Estimate answer to one decimal place.        B         x              x  A=23         x         x                        x c=14 x              ... more
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01/07/17

Help? (find the missing side)
Find the missing side of the triangle below. Estimate answer to one decimal place.          A          b =4        C          x x x x x x x x           x 60°          x            x          ... more
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07/06/16

Law of Cosines and bearings word problems PLEASE HELP ASAP
1) Two planes fly from a point A. The angle between their two flight paths is 42 degrees. one plane has flown 35 miles from point A and the other has flown 20 miles from point A. How far apart are... more
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06/02/16

0 0 A man wants to build a triangular lot. What would Angle A, B, and C? (Side lengths in description)
P.s sorry can't draw the triangle it would have made it easier.AB is 211.BC is 142. AC is 185. Thanks :)
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06/01/16

A man wants to build a triangular lot. What would Angle A, B, and C? (Side lengths in description)
P.s sorry can't draw the triangle it would have made it easier. AB is 211. BC is 142.  AC is 185.  Thanks :)
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05/31/16

Angle A is 43, Angle B= 70 b=85 what is a?
find the indicated side to the nearest tenth.  Thanks :)
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05/28/16

Solve for 2cos-sin^2x=cos^2x over the interval [0,2pi)
Solve for 2cosx - sin2x= cos2x over the interval [0,2pi)   1.) x=pi/6 and 11pi/6 2.) x=5pi/6 and 7pi/6 3.) x=2pi/3 and 4pi/3 4.) x=pi/3 and 5pi/3
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04/02/16

Confused on law of cosines with the given SAS values
I have  a = 65 b = ? c = 50   <A = ? <B = ? <C = 52   Now I understand the b2 = a2 + c2 - 2ac*CosB and the other 2 variants of the formula but how do I solve it when I don't have... more
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07/30/15

Tokyo, Japan and Tehran, Iran, lie on a latitude of 38 and 47/60 degrees and longitu...
Tokyo, Japan and Tehran, Iran, lie on a latitude of 38 47' 00" and longitude of 141 2' 00" East and 52 5' 00" East, respectively. What is the length of the line of constant latitude between these... more
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12/09/14

Law of Cosines
Use the Law of Cosines to find angle B if a=4,b=6, and c=9 (Round to 2 decimals places)   I don't know if this answer is right but this is what I did   cos B = (6^2 - 4^2 - 9^2/-2(4)(9)) =... more
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09/15/14

In triangle ABC: B , C are two acute angles
AD is drawn perpendicular to BC ,m(BAD)=alpha,and m(CAD)=beta Prove that:AD=a*cos(alpha)*cos(beta)/sin(alpha+beta)  
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08/07/14

Law of cosines
For the kite shown in the figure, use the Law of Cosines to find the lengths of the two dowels required for the diagonal supports, where a = 70 cm, b = 150 cm, α = 55°, and β = 42.24°.
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02/08/14

How to solve an acute triangle with a missing side by using the law of cosines
How to solve an acute triangle with a missing side by using the law of cosines.... Segment CB is 45, segment BA is 43, segment CA is unknown "b", <B is 88 degrees. I am supposed to find <A,... more
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