Question

classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle - type definitions

A right - angle measures 90°, an acute angle measures less than 90°, and an obtuse angle measures greater than 90° but less than 180°.

Step2: Classify ∠A

Since ∠A = 90°, it is a right angle.

Step3: Classify ∠B

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

Step4: Classify ∠C

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

Step5: Classify ∠D

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

Answer:

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