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secondary 4 | E Maths
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chocolatebanana
Chocolatebanana

secondary 4 chevron_right E Maths chevron_right Singapore

please help with b!

Date Posted: 5 years ago
Views: 239

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
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.
chocolatebanana
Chocolatebanana
5 years ago
thankyou!