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lasardia
31.01.2022 •
Mathematics
Danny is riding a Ferris wheel with radius 20 m. The wheel does a whole revolution in 10 minutes. If Danny starts at 0 m above the ground, how far above ground is he after 2.5 minutes?
10 m
40 m
30 m
20 m
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Ответ:
Question (2a):
Given that sum of triangle = 180°
∠1 + ∠2 + ∠3 = 180°
∠3 = 180° - ∠1 - ∠2 (1)
Given that sum of angles on the adjacent line = 180°
∠3 + ∠4 = 180°
∠4 = 180° - ∠3 (2)
Sub (1) into (2)
∠4 = 180° - (180° - ∠1 - ∠2 )
∠4 = 180° - 180° + ∠1 +∠2
∠4 = ∠1 +∠2 (proven)
Question (2b):
∠4 = 52° + 25°
∠4 = 77°