
Here's the solution ~
As we know, we can calculate the circumference of a circle in terms of its diameter as :

where, c = circumference and d = diameter
And also, circumference of circle is terms of radius (r) is :

Now, let's move on to questions ~
<h3>First </h3>


<h3 />
・ .━━━━━━━†━━━━━━━━━.・
<h3>Second</h3><h3 /><h3 /><h3 /><h3>

</h3>

・ .━━━━━━━†━━━━━━━━━.・
<h3>Third</h3>


・ .━━━━━━━†━━━━━━━━━.・
<h3>Fourth</h3>



・ .━━━━━━━†━━━━━━━━━.・
<h3>Fifth </h3>



・ .━━━━━━━†━━━━━━━━━.・
<h3>Sixth</h3>



➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖
What triangle? Is there one on here?
Answer:
2/1 or 2
Step-by-step explanation:
You go up 6 and over 3 simplify 6/3 to 2/1=2
An exterior angle is equal to the sum of the 2 non adjacent angles. In this case
100 = x + 70 Subtract 70
x = 100 - 70
x = 30