Answer and Explanation
Your Answer is
Correct Answer is D
Explanation
20 triangles should have 60 sides. In the case of this question, each side is shared by two triangles at the same time, so use 60÷2=30.
Use the following information to answer questions 47-49.
A regular icosahedron is a solid that has 20 congruent faces, each of which is an equilateral triangle. Each vertex is shared by 5 faces, and each edge is shared by 2 faces.
A specialty die used in a certain board game is in the shape of a regular icosahedron with a certain number of dots on each of the 20 faces. In the image below, 10 faces of the die are visible.
The table below lists the total number of faces on this die that have the given number of dots.
47. How many edges does the specialty die have?