Question

prove corollary 2 to 7.3

Answer 1

@jim_thompson5910 You'll be better at explaining.

Answer 2

do you know similar triangle?

Answer 3

not really good at it

Answer 4

ABC is similar to ACD, you agree?

Answer 5

so AB corresponds to AC while AC corresponds to AD, thus\[\frac{ AB }{ AC}=\frac{ AC }{ AD}\]

Answer 6

ok so what now

Answer 7

so we have done the first one

Answer 8

for the second one. ABC is similar to BCD.

That means AB corresponds to BC, while BC corresponds to BD. so \[\frac{ AB }{ BC }=\frac{ BC }{ BD}\] QED

Answer 9

is that all i have to do

Answer 10

of cuz

Answer 11

say caozeyuan is awesome, SAY IT! LOL!

Answer 12

@caozeyuan is awesome

Answer 13

HAHA I copied you and I successed!@terenzreignz LOL

Answer 14

@terenzreignz

Answer 15

@caozeyuan what