What is em halves?

How do you determine when solid figures are similar? What is the difference between a right and acute and obtuse triangle? Which point lies on a circle with a radius of 5 units and center at P6 1? Gross ton equals how many pounds? A number greater than 1 that has more than two whole number factors? What expresses the number 0.0000053 in scientific notation? What is the best recorded time for under 10 girls 1km run? Is 171 prime or composite? What is the angle of incidence if a reflected wave bounces off a mirror at an angle of fifty five degrees? What is the meaning of nonstandard units of measurement? What is the middle day of the year? What is 13 percent in lowest terms? How much is 1 billion in taka? Why positive displacement are called positive? What does it mean for a prouduct of factors to be expressed using exponents? What is the percentage of 7 out of 10? What is the scientific notation for 0.093? How many Johns are mentioned in the Bible? Can you have a negative position while having a positive velocity? How many 9 decimeter equals meter?