∴△PDC∽△PAB,
∴
CD |
AB |
PD |
PA |
PC |
PB |
3 |
7 |
∴
PD |
AD |
PC |
BC |
3 |
4 |
∴
PD |
AD |
PC |
BC |
PD+PC |
AD+BC |
3 |
4 |
∵梯形ABCD的周长为16厘米,上底CD=3厘米,下底AB=7厘米,
∴AD+BC=16-3-7=6(厘米),
∴PD+PC=
3 |
4 |
3 |
4 |
9 |
2 |
∴△PCD的周长为:PD+PC+CD=
9 |
2 |
15 |
2 |
CD |
AB |
PD |
PA |
PC |
PB |
3 |
7 |
PD |
AD |
PC |
BC |
3 |
4 |
PD |
AD |
PC |
BC |
PD+PC |
AD+BC |
3 |
4 |
3 |
4 |
3 |
4 |
9 |
2 |
9 |
2 |
15 |
2 |