1900 10. In the following diagram it is given that DEC, AB || DC, AD || EB and AD BC.
(a) Why isn't ABCD a parallelogram even though it has a pair of
parallel side and a pair of congruent sides?
А
2
с
E
D
(b) Explain why BE must be congruent to BC. Further explain what type of triangle this makes AEBC and
what it tells you about 1 and 22.
(C) Finally, why must 23= 21? Further, explain why we now know that 23% 22.
00
11. Given that ABCD is a parallelogram with diagonal AC bisecting ZBCD, prove
that ABCD must be a rhombus.
3
2
1
с
D
lol