Question

In given figure show that AB //BC

Answer 1

In figure

angle DFI = 100. ... (opposite angle of JFH)

angle GIE = 45. ... (opposite angle of FIH)

IN triangle GIE

angle GIE + angle IGE +angle GEI=180

45+55+angle GEI=180

angle GEI =80

angle GEI +angle DFI

=100+80

=180

SO line AB//line CD.... ( alternate angles test)