Chideyaa223
Chideyaa223 Chideyaa223
  • 15-07-2016
  • Mathematics
contestada

Help explAin & answer

Help explAin amp answer class=

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caylus
caylus caylus
  • 17-07-2016
Hello,

Sorry, i don't know the theorem in English

"Théorème des angles extérieurs :
la mesure en degré d’un angle extérieur est égale à la moitié de la différence des arcs interceptés par ses côtés."
Here

2x+15=1/2(10x+20-80)
==>4x+30=10x-60
==>6x=30+60
==>6x=90
==>x=15 °

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