Thy eagle pinion is chained down at last, And grovelling in the lowly dust art thou : Thy minstrel hath no wreath to weave for thee Save the sad story, of thy misery!

If the sides of a triangle are 6 cm, 8 cm and 10 cm respectively, determine whether the triangle is right angled triangle or not.

In a fee lattice structure, what is the effective number of atoms? 

(a) 4 

(b) 3 

(c) 2 

(d) 1.