Penjelasan dengan langkah-langkah:
GARIS dan SUDUT
jika AF // BE,
maka
3x – 4 = y
3x = 4 + 80
x = 84
3
x = 28°
2x + 4 = 2×28 + 4
2x + 4 = 56 + 4
2x + 4 = 60°
ABC = 180° – (3x – 4 + 2x + 4)
ABC = 180° – (80° + 60°)
ABC = 180° – 140°
ABC = 40°
EBC = 180° – ABC – y
EBC = 180° – 40° – 80°
EBC = 180° – 120°
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Penjelasan dengan langkah-langkah:
GARIS dan SUDUT
jika AF // BE,
maka
3x – 4 = y
3x = 4 + 80
x = 84
3
x = 28°
2x + 4 = 2×28 + 4
2x + 4 = 56 + 4
2x + 4 = 60°
ABC = 180° – (3x – 4 + 2x + 4)
ABC = 180° – (80° + 60°)
ABC = 180° – 140°
ABC = 40°
EBC = 180° – ABC – y
EBC = 180° – 40° – 80°
EBC = 180° – 120°
EBC = 60°