∴BD=2AO,BD=2CO,
∴AO=CO,
∴∠1=∠2.
She ____ ____ dancing lessons.
①∠CAD=30° ②BD= 7 ③S平行四边形ABCD=AB•AC ④OE= 14 AD ⑤S△APO= 312 ,正确的个数是( )