Question

The true length of edge of cube is 15 cm what will be the isometric length?

(a) 17.78 cm

(b) 14.48 cm

(c) 12.99 cm

(d) 12.22 cm

This question was posed to me during a job interview.

My doubt stems from Isometric Axes, Lines and Planes in section Isometric Projection of Engineering Drawing

Answer 1

Right answer is (d) 12.22 cm

The explanation is: The ratio of isometric length to true length is 0.815 so here it is given true length of 15 cm. 0.815 = isometric length / 15 cm => isometric length = 15 cm x 0.815 = 12.22 cm. Every time the true length is more than isometric length.