What is the graph of the normal distribution often called?
AnswerThe bell curve
The normal distribution's symmetric, hump-shaped graph is nicknamed the bell curve.
Science · Facts & stats
Curve facts & stats
7 fact-checked facts about curves in math, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the formula for the circumference of a circle with radius r?
Answer2πr
Circumference is 2πr; πr² is the circle's area.
Going deeper
According to Kepler, planets orbit the Sun in what shape?
AnswerEllipse
Kepler's first law states each planet moves in an ellipse with the Sun at one focus.
Circles, ellipses, parabolas and hyperbolas can all be made by slicing what shape?
AnswerA cone
These curves are called conic sections because they come from cutting a double cone with a plane.
How many radians are in a full circle?
Answer2π
A full turn is 2π radians, equal to 360 degrees.
Expert level
What is the curve formed by a chain or cable hanging freely between two supports?
AnswerCatenary
A hanging chain forms a catenary, which looks similar to a parabola but follows a hyperbolic cosine.
The shell of the chambered nautilus closely follows which type of spiral?
AnswerLogarithmic spiral
The nautilus grows in a logarithmic spiral, keeping the same shape as each chamber gets larger.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round