(11) All the sides of a rhombus are equal in length.
(12) 1 + (8)^2 is an irrational number.
(13) Milk is white.
(14) The number 30 has four prime factors.
(15) Paris is in France.
(16) Sin x is an even function.
(17) Every square matrix is non-singular.
(18) Jupiter is a planet.
(19) The product of a complex number and its conjugate is purely imaginary.
(20) Isosceles triangles are equilateral.
