Angles and triangles · कोण और त्रिभुज
A free Maths lesson for Class 5 children.
An angle is made when two lines meet at a point.
We measure angles in degrees with a protractor.
An acute angle is smaller than 90 degrees.
A right angle is exactly 90 degrees, like the corner of a book.
An obtuse angle is bigger than 90 degrees but smaller than 180 degrees.
A straight angle is 180 degrees. It looks like a straight line.
The three angles of any triangle always add up to 180 degrees.