The fact that it is "a phrase" suggests that it is not a sentence. It is a fragment (a noun, subject) without a verb as a predicate, e.g. "Eight inches of snow fell."
In the phrase, 'eight fat penguins', the word eight is an adjective used to define the number of penguins. The number eight is a noun when it is used as a number, for example, 'the apartment is number eight', 'the eight of clubs', or 'eight plus two equals ten'. Please note that 'eight fat penguins' is not a sentence, there is no verb included.
Eight inches is about 0.2032 meters.
An 8x8 picture is eight inches by eight inches. To get an idea of what eight inches looks like college rule notebook paper is eight inches wide.
One!
Eight inches equates to 20.32 cm
Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered. EIGHT HUNDRED FIFTY THOUSAND: WHAT ABOUT IT?
38
Yes, an 'eight month old' (singular month) can be considered a noun phrase (or even an open compound noun) and used as the subject or an object of a sentence or phrase; for example, 'An eight month old becomes very curious.'Used as 'The baby is eight months old.', the noun 'eight' becomes an adjective describing the noun months.
Eight inches rounded to the nearest half inch is still eight inches.
56 inches
A cylinder with a diameter of eight inches and a height of five inches has a surface area of 226.2 square inches.
96 inches.