A cylindrical bar has length 10 cm, radius 2 cm, density 8 g/cm^3. Approximately what is its mass? (Use \pi \approx 3.14.)

About 1{,}005 g Volume = \pi r^2 h = 3.14 \cdot 4 \cdot 10 = 125.6 cm^3. Mass = 125.6 \cdot 8 \approx 1{,}005 g.

Ratios, Rates, Proportional Relationships, and Units

SAT Math· difficulty 4/5

10

Explanation

= \pi r^2 h = 3.14 \cdot 4 \cdot 10 = 125.6

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