Zacharias15 Zacharias15

12-05-2016
Mathematics

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I need help with #11. I've just started Trig today. The back of the book says the answer is 0.75 if that helps.

I need help with 11 Ive just started Trig today The back of the book says the answer is 075 if that helps class=

Respuesta :

12-05-2016

Hi,
BC²=CA²-BA²=13-9=4=2² (Pythagore)

CB/ED=AB/AD (Thalès)
2/2.5=3/AD==>AD=3*2.5/2=7.5/2
DB=DA-AB=7.5/2-3=0.75
I don't know how you call this 2 theorems (sorry)

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