38 + 38 =78? i'm not sure cuz you had typo's.
Answer:
Regular Pentagon
Step-by-step explanation:
A regular icosahedron is a twenty-faced polyhedron, each face being an equiangular triangle. Each vertex is joined together by 5 faces, therefore the polygon formed at each vertex is a regular pentagon.
We can also figure out the number of faces at each vertex using Euler's formula
F+V=E+2
F=number of faces = 20
E=number of edges = number of triangular faces * edges/triangle /2
(since each edge is shared between two faces)
= 20*3/2
=30
Number of vertices
= E+2-F = 30+2-20 = 12
So number of edges meeting at each vertex
= 30 / (12/2) = 30/6 = 5
(12/2 because each edge joins two vertices).
See attached figure, courtesy of Wikipedia.
In rotation, the angle through which the plane figure is rotated is called the point of a figure through a specified angle and direction about a fixed point. Identify the corresponding vertices of the rotation.
divide the price of the olive oil by the volume of the olive oil
to find the price per ounce. 5.88/25oz=0.2352 dollars/ounce. Then you
have to multiply the volume of the bottle by .60 to find what 60% of the
volume is.
0.60x25=15 ounces. since in the first two weeks she used 15
ounces which has a price of 0.2352 dollars/ounce you have to multiply
15 by 0.2352 which equals 3.528 dollars.