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A kite string, a ruler edge, a torch beam. What shapes are they?

Every corner where two bars meet is an angle.

This is Chapter 2, Lines and Angles, in your NCERT book.

What you will learn

Point, line, ray, segment. Four shapes with different ends.
Two lines. Lines that cross, and lines that never meet.
What is an angle. Two rays that share one start point.
Measuring. Degrees, and how a protractor reads them.
Kinds of angles. Acute, right, obtuse, straight and reflex.
Drawing. Making an angle of an exact size.
Angles around us. Doors, scissors and clocks.

Need a quick recap?

Shapes around us (Track Zero). Counting the corners of a shape.