Find the missing side or angle. Round to the nearest tenth.
7
B = 20°
a=120
c=110
b=[ ? ]
Enter

9514 1404 393

  41.1

Step-by-step explanation:

A triangle solver can do this nicely. b ≈ 41.1

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You can use the law of cosines for the purpose.

  b² = a² +c² -2ac·cos(B)

  b² = 120² +110² -2(120)(110)·cos(20°) ≈ 1692.1148

  b ≈ √1692.1148 ≈ 41.13532

The missing side is b ≈ 41.1 units.

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm