Cross multiply
18 / X = 2.4 / 28
so
18 * 28 = X (2.4)
and that becomes
504 = X * 2.4
then divide by 2.4
X = 210
Answer:
8.7 units
Step-by-step explanation:
Given is a right angled triangle (because the segment with 5 units length is tangent to circle. Tangent is perpendicular to RADIUS or diameter)
Let the length of the diameter be d units
By Pythagoras Theorem:

Use this diagram, it might help.
From the inside, whatever that layer is, it can be any of the layers outside of it.
All whole numbers
can be a rational number, but not all rational numbers
be a whole number.
Kind of like all squares can be rectangles, but not all rectangles can be a square.
The whole number has all the attributes of a rational number, but not all rational numbers have all of the attributes of a whole number.