show that the product of two triangular matrices is itself triangular

A triangular age pyramid has

Explain how will you determine experimentally the position of the centre of gravity for a triangular lamina (or a triangular piece of card board).

Which of the following is a triangular matrix? (A) a scalar matrix (B) a lower triangular matrix (C) an upper triangular matrix (D) a diagonal matrix

Molecular motion shows itself as

Neha covers a distance of 1,040 m when she takes two rounds of a triangular park with two sides measuring 120 m each. Find the length of the third side of the park.

The group having triangular planar structures is :

The figure shows a metallic plate of uniform thickness and density. The value of l in terms of L so that the centre of mass of the system lies at the interface of the triangular and rectangular portion is

Let R be a square matrix of order greater than 1 such that R is upper triangular matrix .Further suppose that none of the diagonal elements of the square matrix R vanishes. Then (A) R must be non singular (B) R^-1 does not exist (C) R^-1 is an upper triangular matrix (D) R^-1 is a lower triangular matrix