The sum of the internal angles of a triangle
What is 180°?
Half past 9:00pm in 24hr time
What is 21:30?
The number of fingers am I holding behind my back right now
What is 3
A letter used in a mathematical equation to represent a number of possible constant values.
What is a variable.
The number of terrestrial kilometers in a nautical kilometer
What is 1?
A regular polygon that tiles the plane
What is a square?
OR
What is a (equilateral) triangle?
OR
What is a (regular) hexagon?
This circular timekeeping device is often used as a metahor to introduce students to modular arithmetic

What is an analog clock?
The 6th prime number
What is 11?
AAA = 8
What is A = 2?
Joan's height
What is 6'4?
This diagram, infamous among early calculus students, is used to convert common angle measurements from degrees to radians

What is the unit circle?
Fifteen minutes in decimal time
What is .25?
The number of sides on a tetrahedron.
What is 4?
The first 3 digits of e.
What is 2.71?
The non-coherent unit used to measure the height of horses.
What is a hand?

The name of the shape silhouetted above

What is an icosahedron?
The time that is sun set
What is nighttime?
This controversial integer, invented by Al-Khwarizmi, is only sometimes included in the set of natural numbers
What is zero?
This letter is used in many branches of mathematics to represent infinitesimally small values.
What is epsilon (ε)?
This this unit is not consistent across industries and is named after the cylindrical containers liquids (and various other things) are stored in.
What is a barrel?
This 3-D geometric object, shaped like a jug, is known for its non-orientable surface, continuous surface
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What is a klein bottle?
1.75 units of decimal time plus 3 hours
What is 4 3/4 hours?
ACAB
What is 1312
3a - b = 0
2a + b = 25
What is a = 5, b = 15 ?
The number of feet in 2 miles
what is 10560?