Question

classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle - type definitions

An acute angle measures less than 90°. A right angle measures 90°. An obtuse angle measures greater than 90° and less than 180°.

Step2: Analyze ∠A

Since ∠A = 90°, it is a right - angle.

Step3: Analyze ∠B

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

Step4: Analyze ∠C

Since ∠C = 140° and 90°<140°<180°, ∠C is an obtuse angle.

Step5: Analyze ∠D

Since ∠D = 70° and 70° < 90°, ∠D is an acute angle.

Answer:

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