where will the hour hand of a clock stop if it start from 4 and turn throug right angle
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Annettu:
△ ABC on suorassa kulmassa kohdassa C, ∠B = 60∘
∠C = 90∘
Tiedämme sen,
Kolmiossa ABC ∠A+∠B+∠C = 180∘
60∘+∠A+90∘ = 180∘
∠A = 30∘
Meillä on,
sinA = ABCB
sin30∘ = 15CB
21 × 15 = CB
CB = 7,5 yksikköä
Pythagilta
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