Question

please give correct answers ​

Answer 1

Step-by-step explanation:

opposite sides are equal in trapezium

AD//BC

DC//AB

Answer 2

$\small\bold{Here, \angle C+\angle B=80\degree+100\degree=180\degree}$

[Sum of interior opposite angles is 180°]

$\small \bold{\therefore \:DC \: and \: AB \: are \: parallel.}$

Hence, ABCD is a trapezium.