Final answer:
The question is about the properties of a triangular rod including its length, mass, density, and volume.
Step-by-step explanation:
The subject of this question is physics. The question asks about the properties of a triangular rod. Specifically, it asks about the length, mass, density, and volume of the rod.
a) The length of the rod is given as l. b) The mass of the rod is given as m. c) The density of the rod is not provided in the question. d) The volume of the rod can be calculated by multiplying the cross-sectional area of the rod by its length.