Umm. Is this high school?.
4 friends x 2 ballons = 8 friends only ballons.
8 + 1 = 9.
9 total
1 3/7 ~ One and three sevenths
Based on the calculation, the perimeter of the horizontal cross-section is equal to 36.13 cm.
<h3>How to calculate the perimeter?</h3>
In this scenario, the resulting geometrical shape formed when the cut is made at the middle of the height of the trapezoid and then rotated is a circle.
<u>Given the following data:</u>
From the middle, the diameter of this circle is given by:
D = 1/2 (10 + 13)
D = 11.5 cm.
Now, we can calculate the perimeter:
Perimeter = πD
Perimeter = 3.142 × 11.5
Perimeter = 36.13 cm.
Read more on trapezoid here: brainly.com/question/4758162
#SPJ1
Answer:

.
Step-by-step explanation:
Arithmetic sequence

.
First step, find its difference



.
So, we get


.
Finally, Let's find the 75th term




Answer:
<h2>Three</h2>
The answer is that the shape has three lines of symmetry, one from each vertex to the middle of the opposite side.
Step-by-step explanation: