PLEASE HELP. I will do anything, please. May someone explain what I have to do? Explain with steps please. I’m having trouble comprehending this.

Answer:
To prove : ΔDEC ~ ΔDAB
angle DEC = angle DAB...... ( Corresponding angles when Line EC || Line AB and EC being the transversal)
angle EDC = angle ADB......( Common angle D)
therefore, ΔDEC ~ ΔDAB by A - A test of similarity.