Question

classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle definitions

• Acute angle: \(0^{\circ}<\theta < 90^{\circ}\)
• Right angle: \(\theta = 90^{\circ}\)
• Obtuse angle: \(90^{\circ}<\theta < 180^{\circ}\)

Step2: Classify \(\angle A\)

Since \(0^{\circ}<70^{\circ}<90^{\circ}\), \(\angle A\) is acute.

Step3: Classify \(\angle B\)

Since \(90^{\circ}<140^{\circ}<180^{\circ}\), \(\angle B\) is obtuse.

Step4: Classify \(\angle C\)

Since \(0^{\circ}<60^{\circ}<90^{\circ}\), \(\angle C\) is acute.

Step5: Classify \(\angle D\)

Since \(\angle D = 90^{\circ}\), \(\angle D\) is right.

Answer:

\(\angle A\): Acute
\(\angle B\): Obtuse
\(\angle C\): Acute
\(\angle D\): Right