Question

classify the four angles of the quadrilateral.
a 70°
b 140°
c 60°
d 90°

Explanation:

Step1: Recall angle - type definitions

Acute: less than 90°. Right: equal to 90°. Obtuse: greater than 90° and less than 180°.

Step2: Classify ∠A

∠A = 70°, so it's acute.

Step3: Classify ∠B

∠B = 140°, so it's obtuse.

Step4: Classify ∠C

∠C = 60°, so it's acute.

Step5: Classify ∠D

∠D = 90°, so it's right.

Answer:

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