AE |
CE |
DF |
BF |
1 |
2 |
2 |
3 |
2 |
3 |
x2+x2 |
9
| ||
2 |
9
| ||
4 |
9
| ||
4 |
2 |
3 |
3
| ||
2 |
9
| ||
2 |
1 |
2 |
9
| ||
4 |
9
| ||
2 |
3
| ||
2 |
81 |
8 |
A.72.8 cm | B.51 cm | C.36.4 cm | D.28 cm |
A.只有一组对边平行的四边形是梯形 |
B.矩形可以看作是一种特殊的梯形 |
C.梯形有两个内角是锐角,其余两个角是钝角 |
D.梯形的对角互补 |
S△ABF |
S△CEF |
A.1:2:3:4 | B.1:2:2:1 | C.1:2:1:2 | D.1:2:3:1 |
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