A Tritone is?

A. Any three notes that, when played together, sound pleasing
B. A chord consisting of three notes
C. An interval of three whole steps
D. An interval that played an Important part in 12th century music compositions

Hello, The correct answer is (B)

Explanation:

It is called tritone the interval between heights of two musical notes that has exactly three whole tones. The so-called tritone effect is one of the most complex dissonances possible in western music.  

The tritone causes a sensation of movement, which makes it very explored in moments of "tension" of the music.

The tritone is an essential element of some heavy metal groups, composing its characteristic musical atmosphere.

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coordinates of r(b,c)

slope of nm is 0.

step-by-step explanation:

the midpoint of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

the midpoint of the line segment nk is given by

∴r(b,c)

the slope of the line joining the points (x₁,y₁) and (x₂,y₂) is given by

slope of rs is

hence

coordinates of r(b,c)

and slope of nm is 0.