Which polygon is a concave octagon? A polygon has 7 sides. One angle goes inside of the shape. A polygon has 8 sides. A polygon has 8 sides. One angle goes inside of the shape. A polygon has 7 sides.

The polygon with 8 sides and a concave shape

Step-by-step explanation:

A polygon is any two-dimensional structure shaped by straight lines. Triangles, quadrilaterals, pentagons and hexagons are representations of polygons. You see, the name shows you how many sides the form has.

If in octagon all angles are equal and all sides are equal, it is considered a normal octagon, then it is classified as an unusual octagon. When the interior angle of the octagon is greater than 180 °, it is called the concave octagon.

there are lots of ways.   pick's theorem tells us if the vertices are lattice points the area a is

a = b/2 + i - 1

where b is the number of boundary lattice points and i is the number of interior lattice points.

in the figure i count b=16, i=50 so

a = 8 + 50 - 1 = 57

let's try the shoelace formula.   the area is half the sum of the cross products of the sides.  

a(-2,6)   -2(2)-6(-5) = 26

b(-5,2)   -5(-3) - 2(-2) = 19

c(-2,-3) -2(-3) - (-3)(4) = 18

d(4,-3)   4(3) - (-3)(5) = 27

e(5,3)   5(3) - 3(1) = 12

f(1,3)     1(6) - 3(-2) = 12

a(-2,6)

each of the cross products is twice the area of the triangle with the associated side and one vertex the origin. so the area of abo=26/2=13.

area = (1/2) (26 + 19 +   18 + 27 + 12 + 12) = 57

that checks!

10000

step-by-step explanation: divide by 2,