Question

classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle - type definitions

An acute angle is less than 90°, a right angle is 90°, and an obtuse angle is greater than 90° and less than 180°.

Step2: Classify ∠A

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

Step3: Classify ∠B

Since ∠B = 60°, and 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
∠B		O
∠C			O
∠D	O