All squares are ............

Rhombus and squares are ........................ to each other.

All animals are............. in food chain.

The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the observations is ………….

Fig. shown a uniform square plate from identical squares at the corners can be removed. (a) Where is the centre of mass of the plate originally ? (b) Where is it after square 1 is removed ? (c ) where is it after squares 1 and 2 are removed ? (d) Where is c.m after squares 1, 2, 3, are removed ? (f) Where is c.m after all the four squares are removed ? Answer in terms of quadrants and axes.

If the diagonal of a square is 'a' units, what is the diagonal of the square, whose are is doubel that of the first square?

If A and B are square matrices of the same order such that AB=Ba , then prove by inducation that AB^(n)=B^(n)A . Further , prove that (AB)^(n)=A^(n)B^(n) for all n in N .

If A is a square matrix then A - A' is a …… matrix.

Write contrapositive and converse of the following statements: If square ABCD is a square then its diagonals are congruent.

If A is any square matrix then AA' is a ………. Matrix.

A square of n units is divided into n^(2) squares each of area 1 sq unit. Find the number of ways in which 4 points (out of (n+1)^(2) vertices of the squares) can be chosen so that they form the vertices of a square.