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Qwerty90
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What is the length of Segment AB to the nearest tenth of a meter?
 2 years ago
 2 years ago
Qwerty90 Group Title
What is the length of Segment AB to the nearest tenth of a meter?
 2 years ago
 2 years ago

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UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[AB=AD+DB\] \[\cos(60°)=\sin(30°)=\frac{AD}{14}\] \[\sin(60°)=\cos{(30°)}=\frac{DC}{14}\]
 2 years ago

Qwerty90 Group TitleBest ResponseYou've already chosen the best response.0
Do I then need to use the sin and cosine formula to figure the rest out?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
i still cannot see myself how to get DB
 2 years ago

Qwerty90 Group TitleBest ResponseYou've already chosen the best response.0
lets assume its 30
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
very rough DB~7
 2 years ago

Qwerty90 Group TitleBest ResponseYou've already chosen the best response.0
what do the first two equal?
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
actually you can work out angle DCB with a trig identity, because be know two of the sides, and then use another trig identity to find DB
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
the first two what? @Qwerty90
 2 years ago

Qwerty90 Group TitleBest ResponseYou've already chosen the best response.0
when you gave those first few ratios.. the AD/14 and DC/14 what do those equal
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
you dont know the values of sin 30=cos60? you must remember theses if you dont remember you can use a calculator
 2 years ago

Qwerty90 Group TitleBest ResponseYou've already chosen the best response.0
yes i know those..
 2 years ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[\sin60°=\cos30°\] is a little bit tricker on a calculator, because the value given is irrational but you can square the output 0.86602540... 0.86602540...^2=0.75=3/4 so \[\sin60°=\cos30°= \sqrt{\frac{3}{4}}=\frac{\sqrt3}2\]
 2 years ago
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