Page 102 - Mathematics Class - IX

Pi: is the ratio of the circumference of a circle to its diameter Remainder: is the number that results when the division of
and it is a universal constant, denoted as . whole numbers is not exact.
Place value: is the value of the location of a digit in a numeral. Right angle: is an angle whose measure is 90°.
Polygon: is a closed, many-sided figure in which the line
segments do not cross. S
Polyhedron: is a three-dimensional figure formed by the Secant of a circle: is the line that passes through the circle
union of polygons; the polygons juxtapose only at the edges. and intersects the circle at two distinct points.
Polynomial: is an algebraic expression having two or more Sector: is an area enclosed by an arc and two radii joining
terms. the end points of the arc to the centre.
Power: is an exponent that denotes the number of times a Square of a number: is the product of a number multiplied
number has to be multiplied. by it.
Prime number: is a whole number that is greater than one Square root: is a factor of a number that when squared gives
and has no factors other than one and itself. the number.
Prism: is a three-dimensional figure having two parallel Straight angle: is an angle whose measure is 180°.
polygonal faces, the other faces being parallelograms. Subset: is a set, each of whose elements is an element of
Product: is a number that is obtained as a result of another set.
multiplying two factors. Subtrahend: In subtraction, the smaller number that is to be
Proper fraction: is a fraction, whose numerator is smaller taken away or subtracted.
than the denominator. Sum: The number that is obtained as a result of combining
Properties: are the characteristics of a figure or a shape. the addends in an addition problem.
Proportion: is a statement that denotes the equality of two Supplementary angles: is a pair of angles whose sum is
ratios. 180°.
Pyramid: is a three-dimensional figure of which the base is T
a polygon and the other faces are triangles with a common
vertex. Transversal: is a line which intersects two or more lines.
Q Transposition: is a process in which a term is dropped from
one side of an equation and is written on the other side with
Quadrant: is a sector whose angle is right angle. the opposite sign.
Quadratic Equation: is an equation in one variable Tangent: is a line that is perpendicular to the radius and just
for which at least one term involves the square of the touches the circle at a single point without intersecting it.
variable. Theorem: The results of a mathematical problem that have

Quotient: is the number resulting from the division of been proved or that must be proved.
one number by another.
U
R
Unlike fraction: is a fraction that has different denominators.
Radius: is a segment that connects the centre of the circle to
any point on the circumference of the circle. V
Ratio: is the fraction that is formed when two quantities are
compared by an indicated division. Variable: is a symbol, which takes different numerical
values in different expressions.
Rational numbers: are a set of numbers that consist of the
fractional numbers and their inverses. Vertices: are end points of the line segments in a polygon.
Ray: is a line that includes one end point and extends W
infinitely in one direction.
Real numbers: are the unions of rational and irrational Whole numbers: The counting numbers and zero taken
numbers. together.

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