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mina [271]
3 years ago
9

Pls help ASAP I’ll give brainliest

Mathematics
2 answers:
denis23 [38]3 years ago
8 0

Answer:

  • (A) 44.7°

Step-by-step explanation:

<u>Use the law of cosines:</u>

  • cos A=(b^2+c^2-a^2)/(2bc)
  • cos A=(25^2+31^2-22^2)/(2*25*31)=0.711
  • m∠A = arccos(0.711) ≈ 44.7°

agasfer [191]3 years ago
5 0

Using law of cosines

\\ \sf\longmapsto cosA=\dfrac{b^2+c^2-a^2}{2bc}

\\ \sf\longmapsto cosA=\dfrac{25^2+31^2-32^2}{2(25)(31)}

\\ \sf\longmapsto cosA=\dfrac{625+961-484}{1550}

\\ \sf\longmapsto cosA=\dfrac{1102}{1550}

\\ \sf\longmapsto cosA=0.7109

\\ \sf\longmapsto A=cos^{-1}(0.7109)

\\ \sf\longmapsto A=44.7°

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