Drawing a diagonal means to connect a vertex with another non-adjacent vertex.
So, for each vertex, we have 8-3=5 possible diagonals. This leads to a total of 8*5=40 diagonals.
We have to divide this number by 2 though, because in this way we're counting each diagonal twice (connecting points AB or BA gives the same diagonal).
So, an 8 sided shape has 20 diagonals.
Answer:
a and d are the only options that is 4 times the sum of 257 and 8
Step-by-step explanation:
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Surface area : The area of the surface of the figure.
We will find the area of each separate figure, then add them al up:
Triangle: (3*4) / 2 = 6
For 2 triangles the surface area will be 12.
Square: 3*3 = 9
Rectangle One: 4*3= 12
Rectangle two: 5 * 3 = 15
Now we add them all up:
12 + 9 +12 + 15 = 48
So the surface area is 48 cm^2
Answer:
Surface area = 144 mi.²
Step-by-step explanation:
Surface area of the triangular prism = bh + (P)L
Where,
b = base of triangular base = 6 mi.
h = height of triangular base = 8 mi.
P = Perimeter of triangular base = 10 + 8 + 6 = 24 mi.
L = height of the prism = 4 mi.
Plug the values into the formula
Surface area = 6*8 + (24)4
= 48 + 96
= 144 mi.²