State whether the following statement is true or false.
If one angle of a triangle is less than 90°, it is known as an acute-angled triangle.
True
False
If all the angles of a triangle are less than 90°, it is known as the acute-angled triangle.
If one angle of a triangle is less than 90 degrees, it is known as an acute-angled triangle.
If one angle of a triangle is greater than 90 degrees, it is known as an obtuse-angled triangle.
An obtuse-angled triangle is one in which all the angles are less than 90°. State true or false.