Lines and Angles

Find the size of each angle marked.

Suppose $\angle ABC$ and $\angle DEF$ are complementary angles. If $m\angle ABC=\left(5x+7\right)°$ and $m\angle DEF=\left(3x+3\right)°$. What are the measures of the two angles?

In the given figure, $\overleftrightarrow{AB}$ and $\overleftrightarrow{CD}$ are two intersecting lines that intersect at $O$. Observe the pair of angles and complete the following table.

By Kawasaki's theorem we can tell that a _____ vertex may be folded to form a flat figure.

By Kawasaki's theorem we can tell that a single vertex may be folded to form a flat figure.

What is the notation for perpendicular lines?

The angle marked in _____ colour is the biggest angle.

Use protractor, measure $\angle AOE$  in the given figure.

What is the measure of the given angle.

Find out how many angles are there in the shape below. Mark them.

Find out how many angles are there in the shape below. Mark them.

Find out how many angles are there in the shape below. Mark them.

Draw an angle and name it in three different ways.

The symbol $\angle$ is used for an _____.

The common end point is called the _____ of an angle.

How many rays are formed in an angle? Explain with an diagram?

Which of the following objects are perpendicular to the floor?

Choose the perpendicular line in the following.

Two perpendicular lines are same distance apart.

Two lines formed by two perpendicular line segments are also perpendicular.