1. The problem is to find the measure of angle ADC given that angle ADC is 134° and the answer is 88°. 2. This seems to be a misunderstanding or incomplete information because angle ADC cannot simultaneously be 134° and 88°. 3. If the problem is to find an unknown angle related to angle ADC, we need more context such as a diagram or relationship between angles. 4. Assuming the problem is to find the supplementary angle to 134°, we use the rule that supplementary angles add up to 180°. 5. The formula for supplementary angles is $$\text{angle}_1 + \text{angle}_2 = 180^\circ$$. 6. Applying this, if angle ADC is 134°, then the supplementary angle is $$180^\circ - 134^\circ = 46^\circ$$. 7. Since 88° is given as an answer, it might refer to a different angle or a mistake. 8. Please provide more details or clarify the problem for an accurate solution.