How Well Do You Know Polygonal Number?

1) What represents polygonal numbers often?

Fraction

Pebbles

Inequalities

Lines

Polygonal numbers often represent pebbles.

Explanation

Polygonal numbers often represent pebbles.

2) Which is the first polygonal number?

2

4

3

1

The first polygonal number refers to the first number in a sequence of numbers that can be arranged to form a regular polygon. In this case, the options given are 2, 4, 3, and 1. Among these options, 1 is the correct answer as it is the first polygonal number.

Explanation

The first polygonal number refers to the first number in a sequence of numbers that can be arranged to form a regular polygon. In this case, the options given are 2, 4, 3, and 1. Among these options, 1 is the correct answer as it is the first polygonal number.

3) Which of the following isn't a square number?

15

1

9

4

A square number is the result of multiplying an integer by itself. In this case, 15 is not a square number because there is no integer that can be multiplied by itself to equal 15. On the other hand, 1, 9, and 4 are all square numbers since they can be obtained by multiplying an integer by itself (1x1=1, 3x3=9, 2x2=4).

Explanation

A square number is the result of multiplying an integer by itself. In this case, 15 is not a square number because there is no integer that can be multiplied by itself to equal 15. On the other hand, 1, 9, and 4 are all square numbers since they can be obtained by multiplying an integer by itself (1x1=1, 3x3=9, 2x2=4).

4) Which of these is most important in knowing if a number is polygonal?

Size of circle in the polygon

Angles of the polygon

Size of the polygon

Sides of the polygon

The number of sides in a polygon is the most important factor in determining if a number is polygonal. A polygon is defined as a closed figure with straight sides, so the number of sides directly determines if a number can be represented as a polygon. The size of the circle in the polygon, the angles of the polygon, and the size of the polygon are all secondary factors that depend on the number of sides.

Explanation

The number of sides in a polygon is the most important factor in determining if a number is polygonal. A polygon is defined as a closed figure with straight sides, so the number of sides directly determines if a number can be represented as a polygon. The size of the circle in the polygon, the angles of the polygon, and the size of the polygon are all secondary factors that depend on the number of sides.

5) Which of the following isn't a triangular number?

16

3

6

10

A triangular number is a number that can be represented as a triangle with dots. To determine if a number is triangular, we can use the formula n(n+1)/2, where n is a positive integer. Plugging in the given numbers, we find that 3, 6, and 10 can be represented as triangles with dots, but 16 cannot. Therefore, 16 is not a triangular number.

Explanation

A triangular number is a number that can be represented as a triangle with dots. To determine if a number is triangular, we can use the formula n(n+1)/2, where n is a positive integer. Plugging in the given numbers, we find that 3, 6, and 10 can be represented as triangles with dots, but 16 cannot. Therefore, 16 is not a triangular number.

6) Which would you call the representation of polygonal numbers?

Units

Whole numbers

Fractions

Integers

The representation of polygonal numbers refers to numbers that can be arranged in the form of a polygon. Units, or numbers that represent a single entity or quantity, do not fit this description. Whole numbers, fractions, and integers can all be represented as polygonal numbers, but units cannot. Therefore, the correct answer is not units.

Explanation

The representation of polygonal numbers refers to numbers that can be arranged in the form of a polygon. Units, or numbers that represent a single entity or quantity, do not fit this description. Whole numbers, fractions, and integers can all be represented as polygonal numbers, but units cannot. Therefore, the correct answer is not units.

7) What polygon is best used in determining polygonal numbers?

Octagon

Decagon

Heptagon

Hexagon

Hexagon is the best polygon to determine polygonal numbers. A polygonal number is a number that can be represented by a regular polygon, where each side of the polygon represents a unit. Hexagon, with its six sides, provides a balanced and symmetrical shape that can easily represent polygonal numbers. Octagon, decagon, and heptagon have more or fewer sides, making them less suitable for this purpose.

Explanation

Hexagon is the best polygon to determine polygonal numbers. A polygonal number is a number that can be represented by a regular polygon, where each side of the polygon represents a unit. Hexagon, with its six sides, provides a balanced and symmetrical shape that can easily represent polygonal numbers. Octagon, decagon, and heptagon have more or fewer sides, making them less suitable for this purpose.