1. the angle in a semi circle is a right angle 2. the perpendicular from the centre to a chord bisects the chord 3. the radius of a circle at a given point on its circumference is perpendicular to the tangent to the circle at that given point
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area of a triangle (trig)
1/2absinC
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arc length formula
l=r * angle (radians)
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area of a sector of a circle
1/2r^2*angle (radians)
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angle approximations for sin cos and tan
sinr = r, cosr = 1-r^2/2, tanr = r (all in radians)
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exact values of 0, π/6, π/4, π/3, π/2, π for sin
0 , 1/2, 2^0.5/2, 3^0.5/2, 1, 0
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exact values of 0, π/6, π/4, π/3, π/2, π for cos
1, 3^0.5/2, 2^0.5/2, 1/2, 0, -1
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exact values of 0, π/6, π/4, π/3, π for tan
0, 3^0.5/3, 1, 3^0.5, 0
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value of sec, cosec and cot
1/cos, 1/sin, 1/tan
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trig identities
tan = sin/cos, sin^2r + cos^2r = 1, sec^2 = 1 +tan^2r and cosec^2 = 1 + cot^2r
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