# Resources tagged with: Arithmetic, Geometric and Harmonic Means

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There are 7 NRICH Mathematical resources connected to Arithmetic, Geometric and Harmonic Means, you may find related items under Algebraic expressions, equations and formulae.

Broad Topics > Algebraic expressions, equations and formulae > Arithmetic, Geometric and Harmonic Means ### Mean Geometrically

##### Age 16 to 18Challenge Level

A and B are two points on a circle centre O. Tangents at A and B cut at C. CO cuts the circle at D. What is the relationship between areas of ADBO, ABO and ACBO? ### Classical Means

##### Age 16 to 18Challenge Level

Use the diagram to investigate the classical Pythagorean means. ##### Age 16 to 18

What is the relationship between the arithmetic, geometric and harmonic means of two numbers, the sides of a right angled triangle and the Golden Ratio? ### AMGM

##### Age 14 to 16Challenge Level

Can you use the diagram to prove the AM-GM inequality? ### Three Ways

##### Age 16 to 18Challenge Level

If x + y = -1 find the largest value of xy by coordinate geometry, by calculus and by algebra. ### Pythagorean Golden Means

##### Age 16 to 18Challenge Level

Show that the arithmetic mean, geometric mean and harmonic mean of a and b can be the lengths of the sides of a right-angles triangle if and only if a = bx^3, where x is the Golden Ratio. ### Without Calculus

##### Age 16 to 18Challenge Level

Given that u>0 and v>0 find the smallest possible value of 1/u + 1/v given that u + v = 5 by different methods.