Bell Ringer - ACT Question 04 and 05

Front

What is the sum of the angles formed by intersecting lines?

Back

The sum of the angles formed by intersecting lines is always 360°.

Front

Define vertical angles.

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What is the relationship between adjacent angles formed by intersecting lines?

Back

Adjacent angles formed by intersecting lines are supplementary, meaning their measures add up to 180°.

Front

If one angle measures 150°, what is the measure of its adjacent angle?

Back

The adjacent angle measures 30° because 150° + 30° = 180°.

Front

What is the measure of an angle that is supplementary to a 40° angle?

Back

The supplementary angle measures 140° because 40° + 140° = 180°.

Front

How do you find the measure of an unknown angle when given two angles?

Back

To find the unknown angle, use the equation: Unknown angle = 180° - (Angle 1 + Angle 2) if they are adjacent.

Front

What is the measure of angle x if the other two angles are 150° and 40°?

Back

Angle x = 70° because 150° + 40° + x = 180°.

Front

Define complementary angles.

Back

Complementary angles are two angles whose measures add up to 90°.

Front

What is the measure of an angle that is complementary to a 30° angle?

Back

The complementary angle measures 60° because 30° + 60° = 90°.

Front

What is the formula for finding the measure of an angle in a triangle?

Back

The sum of the angles in a triangle is always 180°.