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You find the area of the circle (using radius²* π). You divide your angle by 360 (or by 2π). You multiply the 2 answers and you find the area of the sector.

You factorise it. First, you find a common factor between a, b and c. Then, you find the 2 numbers that multiplied give you c and added give you b. If a=1, then the additive inverse of those 2 numbers ar...

SOH, CAH, TOA explained using an example. 

x² - 8x + 5 = 0 => (x² - 8x + 16) - 11 = 0 =>(x - 4)² = 11 =>x - 4 = +- sqrt(11) =>x = 4 +- sqrt(11)

k=3