13820785002
13820785002 13820785002
  • 09-03-2020
  • Mathematics
contestada

thank you！calculate the value of x

thank youcalculate the value of x class=

Respuesta :

PollyP52 PollyP52
  • 09-03-2020

Answer:

x =  3√7 cm.

or 7.94 cm to the nearest hundredth.

Step-by-step explanation:

We use the Cosine Rule:

21^2 = x^2 + (2x)^2 - 2x.2x cos 120

21^2 =  5x^2 - 4x^2 * -0.5

441 =   5x^2 + 2x^2

7x^2 = 441

x^2 = 63

x = √63

x = 3√7 cm.

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