Question

xcm
C С
A
120°
2xcm
NOT TO
SCALE
21 cm
B
In triangle ABC, AB = 2x cm, AC = x cm, BC = 21 cm and angle BAC = 120°.
Calculate the value of x.​

Answer 1

Step-by-step explanation:

$120 = ab + ac + bc \\ 120 = 2x + x + 21 \\ 120 = 3x + 21 \\ 120 \div 3 = x + 21 \\ 40 - 21 = x \\ 19 = x \: ans$

Answer 2

Answer:

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