Page 100 - Mathematics Class - IX

GLOSSARY

A Composite: are made up of parts, each of which is itself a
whole.
Addend: is a quantity added to another in forming a sum.
Composite numbers: are non-zero whole numbers with
Acute angle: is an angle whose measure is greater than 0° more than two divisors.
and less than 90°. Concentric circles: are circles which have the same centre

Adjacent angles: are two angles which have a common ray but different radii.
between them. Congruent: two figures are said to be congruent if they

Altitude of a triangle: is a line segment drawn perpendicular have the same size and shape.
from a vertex to the side opposite it. Constant: is a number independent of any variable.
Angle bisector: is a line segment which bisects an angle Cyclic Quadrilateral: is a quadrilateral whose all four
into two parts. vertices lie on a circle.
Arc: is a part of the circumference of a circle.

Area: is the extent of a surface as measured by the number D
of unit squares it contains. Denominator: is a part of a fraction, written below the
numerator.
B
Diagonal: is the line joining two non-adjacent vertices of
Binomial: is an algebraic expression consisting of two a polygon.
terms. Diameter: is a chord that passes through the centre of the
Bisector: is a line which divides a line or an angle into two circle and divides the circle into two equal parts.
equal parts. Diamond: is a special rhombus in which one of its diagonal
is equal to its sides.
C Difference: is the number that is obtained from subtracting

Centroid: is the point of concurrence of the medians of a one quantity from another of the same kind.
triangle. Dividend: is a number to be divided by another number
Chord: is a line segment that connects two points on the (Divisor).
circumference of a circle. Divisor: is a number by which another number (Dividend)
Circumcentre: is the point of concurrence of the is divided.
perpendicular bisectors of a triangle. E
Circumference: is the perimeter of a circle.
Collinear: more than two points in the same straight line Equation: is a statement of equality between two
are said to be collinear. mathematical expressions.
Equiangular: if all the angles of a polygon are equal, it is
Cube: is a body of six faces which are square in shape. said to be equiangular.
Cuboid: is a body of six faces which are a combination of Equilateral: if all the sides of a polygon are equal, it is said
squares and rectangles. to be equilateral.
Corresponding angles: is a pair of angles whose one arm Equivalent fractions: are any two fractions that represent
is a transversal, and the other directed in the same direction.
the same number.
Complementary angles: is a pair of angles whose sum is Even Number: a number that is divisible by two.
a right angle.

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