Question

if ∠a and ∠b are vertical angles, then: mark only one oval. they are supplementary they are congruent they are complementary they are right angles 29. if ∠1 and ∠2 form a linear pair and ∠1≅∠2, then each angle measures: 1 point mark only one oval. 45° 60° 90° 120° 30. if ∠x≅∠y and ∠y≅∠z, then ∠x≅∠z. this property is called: * 1 point mark only one oval. reflexive symmetric transitive addition

Explanation:

Step1: Recall vertical - angle property

Vertical angles are congruent by definition.

Step2: Recall linear - pair property

A linear pair of angles is supplementary, i.e., their sum is 180°. If ∠1 and ∠2 are congruent and form a linear pair, let the measure of each angle be x. Then x + x=180°, so 2x = 180° and x = 90°.

Step3: Recall angle - congruence properties

The property that if ∠X≅∠Y and ∠Y≅∠Z, then ∠X≅∠Z is the transitive property of congruence.

Answer:

1. They are congruent
2. 90°
3. Transitive