Because the area of triangle shadow is 6 cm2 and the length of AE is equal to the length of 2 EC, the area of triangle ADE is 6x2 =12cm2, and the area of triangle BEC is12cm2. The area of triangle AEB is 12X2=24 cm2, and the area of trapezoid is 6+ 12X2+24=54 cm2.
nature
1, the two waists of an isosceles trapezoid are equal.
2. The two bottom angles of the isosceles trapezoid on the same base are equal.
3. The two diagonals of the isosceles trapezoid are equal.
4. The isosceles trapezoid is an axisymmetric figure, and the symmetry axis is a straight line connecting the midpoints of the upper and lower bottoms (a straight line passing through the midpoints of the two bottoms).