Carpenter Red Seal Exam Prep · Question
A roof has a rise of 2.1 metres over a horizontal run of 3.6 metres. What is the roof's pitch, expressed as a ratio of rise to run (in 12)?
To find the pitch in 12, calculate (rise / run) * 12. (2.1 m / 3.6 m) * 12 = 0.5833 * 12 = 7, so the pitch is approximately 7:12. (2.1/3.6)*12=7. It should be 7
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Question: A roof has a rise of 2.1 metres over a horizontal run of 3.6 metres. What is the roof's pitch, expressed as a ratio of rise to run (in 12)?
Answer options:
- 6:12
- 7:12
- 8:12 ✅ 9:12
Correct answer: 9:12
Explanation: To find the pitch in 12, calculate (rise / run) * 12. (2.1 m / 3.6 m) * 12 = 0.5833 * 12 = 7, so the pitch is approximately 7:12. (2.1/3.6)*12=7. It should be 7:12. Distractor was calculated wrong. (2.1 / 3.6) = X / 12 -> X = (2.1 * 12) / 3.6 = 25.2 / 3.6 = 7. Wait, calculating again: (2.1/3.6)*12 = 7. So it should be 7:12, making option B the correct answer.
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