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Questions and Answers

What is the sum of interior angles of a triangle?

120 degrees
180 degrees (correct)
200 degrees
270 degrees

What is the name for a four-sided polygon?

Pentagon
Octagon
Quadrilateral (correct)
Hexagon

What is the formula to find the area of a rectangle?

Length x Width (correct)
(Length x Width) / 2
(Length + Width) x 2
(Length + Width) / 2

What are natural numbers?

Natural numbers are all the numbers starting from 1 till infinity, such as $1, 2, 3, 4, 5, 6, 7, 8, \ldots$. Signup and view all the answers

What are whole numbers?

Whole numbers are all the numbers starting from 0 till infinity, such as $0, 1, 2, 3, 4, 5, 6, 7, 8, 9, \ldots$. Signup and view all the answers

What are integers?

Integers are the whole numbers which can be positive, negative, or zero. For example, $2, 33, 0, -67$ are integers. Signup and view all the answers

What is the definition of the number system?

The collection of numbers is called the number system. These numbers are of different types such as natural numbers, whole numbers, integers, rational numbers, and irrational numbers. Signup and view all the answers

What are rational numbers?

Rational numbers are numbers that can be expressed as the quotient or fraction $\rac{p},{q}$ of two integers, where $q eq 0$. For example, $\rac{2},{3}$, $\rac{-5},{7}$, and $\rac{1},{2}$ are rational numbers. Signup and view all the answers

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Study Notes

Geometry

The sum of the interior angles of a triangle is always 180 degrees.
A four-sided polygon is called a quadrilateral.

Area Calculation

The formula to find the area of a rectangle is given by: Area = length × width.

Number Sets

Natural numbers refer to the set of positive integers starting from 1: {1, 2, 3, ...}.
Whole numbers include all natural numbers plus zero: {0, 1, 2, 3, ...}.
Integers consist of all whole numbers and their negative counterparts: {..., -3, -2, -1, 0, 1, 2, 3, ...}.

Mathematical Concepts

The number system encompasses all types of numbers including natural, whole, integers, rational, and irrational numbers.
Rational numbers are defined as numbers that can be expressed as the quotient of two integers, where the denominator is not zero. Examples include fractions like 1/2, 3/4, and whole numbers like 5 (which can be written as 5/1).