Răspuns:
x = 70°
Explicație pas cu pas:
a II b ;
m(∡ABC) = 60° ; m(∡CEa) = 50° =>
m(∡ADE) = m(∡ABC) = 60° (a II b)
m(∡AED) = m(∡CEa) = 50° (unghiuri opuse la varf)
x = m(∡BAC) = 180°-[m(∡AED) + m(∡ADE)] =
= 180°-(50°+60°) = 180°-110° = 70°
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Răspuns:
x = 70°
Explicație pas cu pas:
a II b ;
m(∡ABC) = 60° ; m(∡CEa) = 50° =>
m(∡ADE) = m(∡ABC) = 60° (a II b)
m(∡AED) = m(∡CEa) = 50° (unghiuri opuse la varf)
x = m(∡BAC) = 180°-[m(∡AED) + m(∡ADE)] =
= 180°-(50°+60°) = 180°-110° = 70°
x = 70°