AMC8 1988 Problem 5

Past Contests AMC8 AMC 8 - 1988
1

If \angle \mathrm{CBD} is a right angle, then this protractor indicates that the measure of \angle \mathrm{ABC} is approximately
Image
Answer Choices
A. 20^{\circ}
B. 40^{\circ}
C. 50^{\circ}
D. 70^{\circ}
E. 120^{\circ}