What's the perimeter of a regular heptagon if one side measures 3 inches?
a. 10 in.
b. 21 in.
c. 18 in.
d. 11 in.
3. a polygon that has all sides the same measure and all angles the same measure is called what?
a. irregular polygon
b. convex polygon
c. regular polygon
d. concave polygon
4. the gazebo in the park is an octagon. each side of the gazebo is 4 feet long. what is the perimeter of the gazebo?
a. 24 feet
b. 36 feet
c. 30 feet
d. 32 feet
5. which of the following best describes a plane?
a. the surface of a flat table
b. a curve in a road
c. the edge of a desk
d. the point of intersection of two walls
6. two angles are supplementary. the first angle measures 40°. what's the measurement of the second angle?
a. 120°
b. 50°
c. 140°
d. 60°
7. in order for a button to fit through its buttonhole, the hole needs to be the size of the button's diameter. what size buttonhole is needed for a button with a circumference of 9.42 centimeters?
a. 6 centimeters
b. 1.5 centimeters
c. 3 centimeters
d. 4 centimeters
8. the pentagon in washington dc is immense in size, with each outside wall 921 feet in length. what is the perimeter of the pentagon?
a. 2,663,476.74 ft.
b. 3,684 ft.
c. 5,526 ft.
d. 4,605 ft.

Part 2) What's the perimeter of a regular heptagon if one side measures 3 inches?

we know that

The number of sides in a regular heptagon is equal to

so

The perimeter is equal to

where

a is the length side

in this problem

substitute

therefore

the answer Part 2) is the option

B. 21 in.

Part 3) A polygon that has all sides the same measure and all angles the same measure is called what?

we know that

When all angles are equal and all sides are equal, is a polygon that is equiangular and equilateral, so, is called a regular polygon

therefore

the answer part 3) is the option

C. Regular polygon

Part 4) The gazebo in the park is an octagon. Each side of the gazebo is 4 feet long. What is the perimeter of the gazebo?

we know that

The number of sides in a octagon is equal to

so

The perimeter is equal to

where

a is the length side

in this problem

substitute

therefore

the answer Part 4) is the option

D. 32 feet

Part 5) Which of the following best describes a plane?

we know that

--The edge of a desk is a piece of a straight or curved line.

-- A curve in a road is a piece of a curved line.

-- The intersection of two walls is a piece of a straight line

therefore

the answer Part 5) is the option

A. The surface of a flat table

Part 6) Two angles are supplementary. The first angle measures 40°. What's the measurement of the second angle?

we know that

Two angles are supplementary if the sum of their angles is equal to degrees

so

Let

x------> the measure of the second angle

therefore

the answer Part 6) is the option

C. 140°

Part 7) In order for a button to fit through its buttonhole, the hole needs to be the size of the button's diameter. What size buttonhole is needed for a button with a circumference of 9.42 centimeters?

we know that

The circumference is equal to

where

D is the diameter

solve for D

therefore

the answer Part 7) is the option

C. 3 centimeters

Part 8) The Pentagon in Washington DC is immense in size, with each outside wall 921 feet in length. What is the perimeter of the Pentagon?

we know that

The number of sides in a pentagon is equal to

so

The perimeter is equal to

where

a is the length side

in this problem

substitute

therefore

the answer Part 8) is the option

D. 4,605 ft.

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

a

step-by-step explanation: