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shanua
21.10.2020 •
Mathematics
Why is 60 to 45 and 4 to 3 are ratios
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Ответ:
y = 25
Step-by-step explanation:
Since AE and BC are parallel, then
∠AED = ∠BCE = 110° ( corresponding angles )
Since EF is the angle bisector of ∠AED, then
∠AEF = ∠FED = 55°
∠AFE and ∠DFE form a straight angle, thus
∠AFE = 180° - 80° = 100°
The sum of the angles in ΔAEF = 180°, thus
y = 180 - (55 + 100) = 180 - 155 = 25