Question

classify the four angles of the quadrilateral.
b 100°
c 60°
a 90° 110° d
right acute obtuse
∠a
∠b
∠c
∠d

Explanation:

Step1: Recall angle - type definitions

An acute angle is between 0° and 90°, a right angle is 90°, and an obtuse angle is between 90° and 180°.

Step2: Classify ∠A

∠A = 90°, so it is a right angle.

Step3: Classify ∠B

∠B = 100°, so it is an obtuse angle.

Step4: Classify ∠C

∠C = 60°, so it is an acute angle.

Step5: Classify ∠D

∠D = 110°, so it is an obtuse angle.

Answer:

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