when two lines intersect, they form two pairs of "opposite" angles called _________ angles?
Congruent
When two lines intersect, they form four angles. The two pairs of opposite angles that are formed are called "vertical angles".
To understand why they are called "vertical angles", let's look at how the lines intersect. When two lines intersect, they form an X shape. The angles that are directly across from each other, on opposite sides of the X, are known as vertical angles.
To find the names of these angles, you can use the properties of intersecting lines. Start by assigning letters to each angle. Let's say we have angle A, angle B, angle C, and angle D. The pairs of vertical angles would be angle A and angle C, and angle B and angle D. These pairs are called vertical angles because they are formed when the lines intersect at a single point and are on opposite sides of each other along the vertical line.
Remember, vertical angles are always congruent, which means they have the same measure. This property can be useful when solving geometric problems involving intersecting lines.
collinear angles
these opposite angles are called
Vertical Angles.