Ch 13 Def

Question 1

Geometry

Answer 1

The word geometry is derived from two greek words geo(earth) and metron(measurements)intact geometry means measurement of the earth or land geometry is an important branch of mathematics

Question 2

Circum cirle

Answer 2

The circle passing through the vertices of the triangle is known as circum circle it’s radius is circum radius and centre as circum centre

Question 3

Inscribe or in circle

Answer 3

A circle which touches the three side of a triangle internally is known as incircle it’s radius as in radius and centre as incentre

Question 4

Escribed circle

Answer 4

A circle touching one side of the triangle externally and two produced sides internally is called escribed circle the center of e circle is called e centre and radius as e radius

Question 5

Concentric circles

Answer 5

Two or more circles are called concentric if they have same common centres

Question 6

Direct common tangents

Answer 6

If the point of contacts of common tangents with the 2 circles are on the same sides of line segment joining their centres then these common tangents are called direct common tangents