classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle - type definitions

An acute angle measures between 0° and 90°, a right - angle measures 90°, and an obtuse angle measures between 90° and 180°.

Step2: Classify ∠A

Since ∠A = 110°, and 90°<110°<180°, ∠A is obtuse.

Step3: Classify ∠B

Since ∠B = 60°, and 0°<60°<90°, ∠B is acute.

Step4: Classify ∠C

Since ∠C = 100°, and 90°<100°<180°, ∠C is obtuse.

Step5: Classify ∠D

Since ∠D = 90°, ∠D is right.

Answer:

	Right	Acute	Obtuse
∠A			●
∠B		●
∠C			●
∠D	●