Question

∠acd and ∠dcb form a linear pair. if m∠dcb = 140°, then m∠acd = ?°

Explanation:

Step1: Linear pair sum to 180°

$\angle ACD + \angle DCB = 180^\circ$

Step2: Substitute ∠DCB=140°

$\angle ACD = 180^\circ - 140^\circ = 40^\circ$

Answer:

40