Question

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

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°, it is an acute angle.

Step4: Classify ∠C

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

Step5: Classify ∠D

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

Answer:

	Right	Acute	Obtuse
∠B		O
∠C			O
∠D		O