The circumference of a circle is 5.2mm find the length of the diameter rounded to 3sf

Consider the equation for the circumference of a circle, 2πr. Notice that this can also be written as 2rπ.

Recall that the diameter of a circle is equal to twice the radius, or

d = 2r

And make a substitution into the original equation, giving us the circumference c = πd. We know the circumference is 5.2mm; plugging in, we get

5.2 = πd.

Note: π is NOT a variable, it represents a number. Therefore, we can solve the equation for the diameter d = c / π, or

d = 5.2 / π.

I'll let you crunch the number :D

I hope this helps!

Corrected Question

The Venn diagram shows three types of numbers: odd (O), even (E), and prime (P). Which is represented by Ø?

(A)  O ⋃ P  (B)E ∩ P   (C)O ⋃ E   (D)E ∩ O

(D) E ∩ O

Step-by-step explanation:

The Venn diagram is reproduced and attached below.

In the Venn diagram, the sets of Odd(O) and Even(E) numbers are disjoint, i.e. there is no intersection.

We can also say the intersection of sets O and E is the empty set.

Therefore: E ∩ O is represented by the empty set Ø.

Generally speaking, a number cannot be even and odd at the same time.

The correct option is D