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iibabycarrotsii
25.04.2021 •
Mathematics
If ∠G measures 40°, ∠F measures 49°, and f is 7 feet, then find g using the Law of Sines. Round your answer to the nearest foot.
4 feet
5 feet
6 feet
7 feet
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Ответ:
75
Step-by-step explanation:
Ответ:
12,5°
Step-by-step explanation:
ΔABC has: ∠BAC + ∠ABC + ∠ACB = 180°
=> 60° + 35° + ∠BAC = 180°
=> ∠BAC = 180°- 60° - 35° = 85°
AE is the angle bisector of ∠BAC
=> ∠BAE = ∠CAE = ∠BAC/2 = 85°/2 = 42,5°
AD⊥BC => ΔADB is the right triangle at D
=> ∠ABD + ∠BAD = 90°
=> ∠BAD = 90° - ∠ABD = 90° - 60° = 30°
but ∠BAE = ∠BAD + ∠DAE = 42,5°
=> ∠DAE = 42,5° - 30° = 12,5°