Question

classify the four angles of the quadrilateral.
right acute obtuse
∠a
∠b
∠c
∠d

Explanation:

Step1: Recall angle - type definitions

An acute angle is less than 90°, a right - angle is equal to 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 an obtuse angle.

Step3: Classify ∠B

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

Step4: Classify ∠C

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

Step5: Classify ∠D

Since ∠D = 90°, ∠D is a right angle.

Answer:

	Right	Acute	Obtuse
∠B		O
∠C			O
∠D	O