What is the name given to a three sided figure?

Do sundials have to be round? What is smaller km or cm? How many times will 8 go into 72? What is 16 times by 2? What is a weight average of a 4 year old? Where would you get a 'fill-in-the-blank' form to give to your creditors so they can send reports to the CRAs? What adds up to 7 and multiplies to 8? How many acute angles are in one triangle? Is millimeter one thousandth of a meter? How many billions form a trillion? What is the percentage of 53 out of 88? What is 6XY if X equals six and Y equals three? 3x plus 5 less than x plus 11? What is the name of the jar that has an endless amount of storage? Why do we get the absolute value of demand slope? What is the difference between a ratio and a prportion? How many hundred are in 1 million? Dan's salary is 70 less than Sam's whose weekly salary is 50 more than Jen's If Jen earns 280 per week how much money does Dan earn per week? 0.25 x 5? What is the square root of rice?