Are you thinking of circumference? That's what one might call the "perimeter" of a circle.
The word "circumference" is used for circles and circular shapes, such as ellipses and ovals. For other plane shapes, the word used is perimeter.
Polygons are flat shapes
The eagle has for centuries been used as a symbol to represent St John the Evangelist, whose gospel begins: "In the beginning was the Word, and the Word was with God and the Word was God". The Word refers to Jesus. The lectern is used to hold the Bible which is also called the Word of God.
"An" is used before a word that begins with a vowel while "A" is used before a word that begins with a consonant.
The article "an" is used before a word when the word begins with a vowel. "A" is used when the word begins with a consonant. The exceptions are when the word begins with a consonant but it sounds like a vowel, or when it begins with a vowel but it sounds like a consonant. There are very few exceptions. And I cannot think of one at the moment.
Maths (mathematics) is matamaitic.
It could be either 'sum' or 'add'.
Yes, a combining vowel is used between a word root and a suffix that begins with a consonant to facilitate pronunciation and maintain word structure.
maths/mathematics = mathématiques
WordArt
The word you are looking for is ear
Usually another word for some frequently used mathematical formula.