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|dw:1360370433442:dw|

First you need to find BC

do you know how to do this?

is bc 5?

good

now set up the following ratio
AE/BD = AC/BC
x/3 = 20/5
solve for x

12

you got it

but why do u set up a ratio?

because the ratio of AE to BD is the same as the ratio of AC to BC

basically, to go from BD to AE, you multiply by 4
to go from BC to AC, you also multiply by 4

so the bigger triangle has side lengths that are 4 times larger than the smaller triangle

setting up a ratio is similar to that idea

oh ok i get it! thank you for your help