Eric Nicholas K's answer to chocolatebanana's Secondary 4 E Maths Singapore question.
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DB is a vertical length (drone directly vertically above B) while BC is on horizontal ground, so angle DBC is 90 degrees (vertical meets horizontal).
We view the triangle in a different direction from the ground ABC, and instead look at the triangle DBC involving a vertical height.
We view the triangle in a different direction from the ground ABC, and instead look at the triangle DBC involving a vertical height.
Date Posted:
5 years ago
thankyou!
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