Binary Edu

A line parallel to a side of a triangle that intersects the other two sides divides them proportionally

A number is divisible by 4 if and only if the last 2 digits is a number divisible by 4.

When each side of the inequality is multiplied by -1, then the direction of the inequality is reversed. Eg, 2 > 1 and -2 < -1

If an equation (i.e.  f(x) = 0) contains all positive co-efficients of any powers of x, it has no positive roots.

If a quadrilateral circumscribes a circle , the sum of a pair of opposite sides is equal to the sum of the other pair.

The hour and the minute hand meet each other after every 65(5/11) minutes after being together at 12:00.

The ratio of the radii of the circumcircle and incircle of an equilateral triangle is 2:1

A parallelogram inscribed in a circle is always a rectangle..

The perpendicular bisectors of sides of a triangle meet at a point, called circumcenter, that is the center of the circumscribed circle

If x divides both y and z, then x divides y+z and x also divides y-z.