Maths Question

I think there are 4 pairs of similar triangles in the figure

let E be the centre of the figure

ABE similar to CDE
BCE similar to ADE
ABC similar to ADC
ABD similar to BCD

4pairs
let中間ac同bd o既interception point係x
abx~cdx(aaa)
axd~bxc(sas)應該係congruent triangles
abd~bac(sas)congruent
adc~bcd(sas)都係congruent

congruent triangles唔知你計唔計similar,計就4,唔計就1