Two times the product of two numbers a and b divided by the sum of the numbers.
See Altitude.
See Sphere.
A seven-sided polygon.
A six-sided polygon.
A symbolic representation of discrete or continuous data, made using bars, where each bar represents a range of values when the variable is continuous.
One of the conic sections.
Center: O;
transverse (real) axis: AB;
conjugate axis: CD;
vertices: A, B;
asymptotes: the straight lines OE and OF.
The side opposite to the right angle in a right triangle.