640 times by 90 = 57600 people
Total number of people attending event=
57600+640= 58240
Hello Madoudou!
#1
So we have:
F which is the number of faces we are looking for
E which are the numbers of edges
and V the number of vertices
We can use the Euler's polyhedron formula. Which is:
V - E + F = 2
Remember we are solving for F. Thus,
F = E - V + 2
F = 9 - 6 + 2
F = 9 - 4
F = 5
The correct answer is option B
#2
It is almost the same problem. They just want us to find the vertices.
V = E - F + 2
V = 36 - 25 + 2
V = 36 - 23
V = 13
The correct answer is option C
#3
<span>The cross section formed by a plane that contains a vertical line of symmetry for a tetrahedron is a Triangle.
The correct answer is option A
#4
</span>
<span>The cross section formed by a plane that intersects three faces of a cube</span><span> is a Triangle.
The correct answer is option A
Let me know if you have any questions about the answers. As always, it is my pleasure to help students like you.
</span>
Answer:
C.E=18 cm
Step-by-step explanation:
we know that
If the circle O is inscribed in triangle ABC
then
A.F=A.D=6 cm
B.D=B.E=14 cm
C.F=C.E=?
The perimeter of triangle is equal to
P=2(6)+2(14)+2(C.E)
P=76 cm
so
76=2(6)+2(14)+2(C.E) -----> solve for C.E
76=12+28+2C.E
2C.E=76-40
C.E=36/2
C.E=18 cm