If the radius of a circle is increased by 3 times, then the diameter will increase

Two lines perpendicular to the same line are.

When two lines do not intersect each other and they have no point in common, they are called intersecting lines.
 

Three or more lines in a plane are said to be concurrent, if all of them pass through the same point.

There are five elements or parts of a triangle.

Two sides of a quadrilateral are said to be opposite sides, if they are not adjacent sides.

Figures which have different initial and end points are called closed figures.

The longest chord of a circle is known as radius of the circle.