In order for the parallelogram to be a rhombus, x=?

Tree diagram to find the prime factors of 18

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.