∴∠CEF=90°．
设CE=x，
在Rt△CEF中，
tan∠CFE=
| CE |
| EF |
则EF=
| CE |
| tan∠CFE |
| x |
| tan21° |
| 8 |
| 3 |
在Rt△CEG中，
∠CGE=
| CE |
| GE |
则GE=
| CE |
| tan∠CGE |
| x |
| tan37° |
| 4 |
| 3 |
∵EF=FG+EG，
∴
| 8 |
| 3 |
| 4 |
| 3 |
x=60米．
∴CD=CE+ED=60+1.5=61.5（米）．
答：古塔的高度约是61.5米
| 3 |
| 5 |
| 3 |
| 4 |
| 9 |
| 25 |
| 3 |
| 8 |
| CE |
| EF |
| CE |
| tan∠CFE |
| x |
| tan21° |
| 8 |
| 3 |
| CE |
| GE |
| CE |
| tan∠CGE |
| x |
| tan37° |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |