Question

What is the measure of angle d

Answer 1

$\angle D =\angle B\\\\ \angle B=\angle A+30\\ \angle A+ \angle B=180\\\\ \angle A+\angle A+30=180\\ 2\angle A=150\\ \angle A=75\\\\ \angle B=75+30=105\\ \boxed{\angle D=105}$