А 4.7 Let ABC be an equilateral triangle in scribed in a circle. Let D, E be the mid points of two sides, and extend DE to meet the circle at F. Prove that E divides F the segment DF in extreme and mean ratio, ie. the rectangle EF x DF equals the square DE. Hint: Use (III.35)

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.