Trigonometric ratios and many more

Angle Sum Property: The sum of all angles of a triangle is 1800If a transversal intersects two parallel lines then each pair of alternate angles are equal.If a transversal intersects two lines such that a pair of alternate interior angles is equal then the two lines are parallel.If a transversal intersect two parallel lines then each pair of interior angles on the same side of the transversal is supplementary.If a transversal intersect two lines such that a pair of interior angles on the same side of the transversal is supplementary then the two lines are parallel.If a side of an angle is produced then the exterior angle so formed is equal to the sum of two interior opposite angles.Area of triangle =Where s=a+b+c/2Surface Area and VolumesCuboid:Surface Area of Cuboid=2(lb+bh+lh)Lateral Surface Area=2(l+b)*hVolume =l*b*hCube:Surface Area=6a2Curved Surface Area=4a2 Volume =a3Cylinder:Total Surface Area=2r(r+h)Curved Surface Area = 2rhVolume = r2hCone:Total Surface Area=r (L+r)Curved Surface Area = rL where L=22Volume =1/3 r2 hHemisphere:Curved Surface Area =2r2Total Surface Area= 3r2Volume= 2/3r3Sphere:Surface Area=4r2Volume=4/3 r3ouTrigonometry Formulae’s:Trigonometrical Ratios of compound angles:Formulae’s for changing the sum or difference into product: