Geometry
In 1795 John Playfair Simplified Euclid's axiom about these, still saying they never meet
what are parallel lines?
From Latin for "twice" and "cut", it means to divide a line or figure into 2 equal parts
What is bisect
it's the square root of the square root of 81
What is 3?
One of these is a straight one-dimensional figure that extends infinitely in both directions
What is a line?
The Mayans were using this by the 4th century; the concept of that number didn't make it to Europe until the 1200s or so
What is zero?
A prism has the same relationship to a pyramid as a cylinder does to this
what is a cone?
"like fractions" have the same this, making it easy to add & subtract them
What is a denominator?
If the legs of a right triangle are 3 inches and 4 inches, this is the length of the hypotenuse
What is 5 inches?
Abbreviated log, it's the exponent to which a base must be raised to produce a certain number
What is a logarithm?
An ancient Hindu text calculates the square root of this integer as 1.4142156 which is correct to 5 decimal places
What is 2?
Between 2 and 2:50pm the minute hand on your watch covers this many degrees
What is 300 degrees?
In a Tom Lehrer song, a movie called "The Eternal triangle" stars Ingrid Bergman as this longest side of a right triangle
What is a hypotenuse?
1/2 of 1/2 of 1/4 equals this fraction
What is 1/16?
For 12 & 16, 4 is the GCF, or greatest this
What is "common factor"?
The Babylonians used base 60, which could be counted on 5 fingers of one hand & the 12 these on 4 fingers of the other
What are the knuckles?
A scalenhedron is a crystal of 8 or 12 faces, each of which is one of these shapes
What is a triangle?
It's a constant that multiplies a variable. In physics, there's a well-known one "of friction"
What is a coefficient?
It's 12% of 75
What is 9?
Add up the lengths of all the sides of a polygon to get this measurement
What is the perimeter?
Some think Ancient Egyptians represented fractions using symbols from the eye of this falcon god
Who was Horus?
In the world of circles, it is the opposite of concentric. It is also used to describe people.
What is eccentric?
These coordinates named for a 17th c. man describe the position of points in space in relation to an x-axis and y-axis
What are Cartesian (coordinates)?
It's the value of y at the point where a graph of the equation y = x + 1 crosses the y-axis
What is 1?
The wavy lines in the expression seen here stand for this
pi ~~ 3.14
What is approximately (equal to)?
Their numerals weren't handy for arithmetic, so ancient Romans did most of their calculating on this device
What was an abacus?