<h2>A. the measures of the angles must be equal.</h2>
Step-by-step explanation:
She can conclude that the measure of the angles must be equal, because vertical angles are angles opposite each other when to lines cross, the only thing they have in common is the vertex, when this happens that pair of angles are congruent.
An image is attached to show an example of vertical angles, which are always congruent.
This is because there is a total of 26 red cards (1/2) and a total of 12 face cards (12/52). So, you multiply 1/2 x 12/52 and get 12/104 or around 11% chance
The answer is 30°. Rule: All three sides must add up to 180°. Since A=60 and the side vertical to the angle which is 90° then side C would be C=90° and that adds up to 150°, so you can conclude that angle B is 30°. I hope I helped!