Is an octogon a quadrilateral

How much pure acid should be added to 50 ml of a 10 percent acid solution to give a 50 percent acid solution? What is 3 in simplified form? How many lines does a sonet contain? Why does it mean to draw a conclusion? What is the name of the shape with 27 letters? How many liters in 17314394 mi3 of water? What shape is the same shape no matter how you look at it from any angle or direction? How much is 30 percent off of 1400.00? What decimal is the same as 2 over 10? Does 145000 people die in about 24 hours? What are synonyms for dummy? The flowchart check if the number is a palindrome number or not? What is 0.7 as a fraction and percentages? How many tatami mats make up a traditional Japanese tea room? What is the probability of picking 2 aces from a standard deck? What is the L.C.M. of 4 5 6 and 10? How do you multiply a whole number by 10? How many books of the Bible have the word Father in it? How do you write 610 in fifths? What is the greatest common factor of the expression 2x2y and 10xy2?

Is an octogon a quadrilateral?