Question

classify the four angles of the quadrilateral.

Explanation:

Step1: Recall angle classifications

• A right angle is exactly \(90^\circ\).
• An acute angle is less than \(90^\circ\) (and greater than \(0^\circ\)).
• An obtuse angle is greater than \(90^\circ\) and less than \(180^\circ\).

Step2: Classify \(\angle A\)

\(\angle A = 90^\circ\), so it is a right angle.

Step3: Classify \(\angle B\)

\(\angle B = 60^\circ\), and \(60^\circ< 90^\circ\), so it is an acute angle.

Step4: Classify \(\angle C\)

\(\angle C = 140^\circ\), and \(90^\circ< 140^\circ< 180^\circ\), so it is an obtuse angle.

Step5: Classify \(\angle D\)

\(\angle D = 70^\circ\), and \(70^\circ< 90^\circ\), so it is an acute angle.

Answer:

	Right	Acute	Obtuse
\(\angle B\)		\(\circ\) (selected)
\(\angle C\)			\(\circ\) (selected)
\(\angle D\)		\(\circ\) (selected)