An iron triangle has a base 12 cm, height 8 cm. If the density is 7.8 g/cm³ and thickness is 1 cm, find its mass.
Show answer & explanation
Correct answer: A
Explanation
Base = 12 cm, Height = 8 cm, Thickness = 1 cm, Density = 7.8 g/cm³
According to the formula: Volume = area × thickness, mass = density × volume
Area = (1/2) × 12 × 8 = 48 cm²
Volume = 48 × 1 = 48 cm³
Mass = 7.8 × 48 = 374.4 grams