A slope of 1:0.4 corresponds to an angle of 68 degrees.<\/span>4-minute gradient<\/p>\n A slope of 1:0.5 corresponds to an angle of 63 degrees.<\/span>5-minute gradient<\/p>\n A slope of 1:0.6 corresponds to an angle of 59 degrees.<\/span>6-minute gradient<\/p>\n A slope of 1:1.0 corresponds to an angle of 45 degrees.<\/span>10% gradient<\/p>\n When the slope angle is like this,The perpendicular direction was subtracted from 90 degrees<\/strong><\/span><\/p>\n The angle perpendicular to a slope of 1:0.3 is 17 degrees.<\/span><\/span><\/p>\n The angle perpendicular to a slope of 1:0.4 is 22 degrees.<\/span><\/p>\n The angle perpendicular to a slope of 1:0.5 is 27 degrees.<\/span><\/p>\n The angle perpendicular to a slope of 1:0.6 is 31 degrees.<\/span><\/p>\n The angle perpendicular to a slope of 1:1.0 is 45 degrees.<\/span><\/p>\n If you calculate this on a calculator, you'll get this result\u2193\u2193<\/span><\/strong><\/span><\/p>\n tan-1(1\u00f70.3) = 73.3 degrees<\/strong><\/span><\/p>\n tan-1(1\u00f70.4) = 68.2 degrees<\/p>\n tan-1(1\u00f70.5) = 63.4 degrees<\/p>\n tan-1(1\u00f70.6) = 59.0 degrees<\/p>\n tan-1(1\u00f71.0) = 45.0 degrees<\/p>\n When I use a calculator, I get a decimal. If I round this off or truncate it,\u2191\u2191<\/span><\/strong><\/span>It will be the same number.<\/p>\n First, (1 \u00f7 0.3) = 3.3333\u2026; the answer is the same when expressed as tan\u207b\u00b9 (arc tangent). And,Right angle<\/strong><\/span>So,<\/p>\n The angle formed by subtracting a number from 90 degrees is the right angle relative to the slope.<\/span><\/strong><\/span>That's how it works.<\/p>\n A 3-minute gradient and a right angle of 73.3 degrees result in 90 degrees \u2013 73.3 degrees = 16.7 degrees.<\/span><\/strong><\/span><\/p>\n A 4-minute gradient and a right angle of 68.2 degrees result in 90 degrees \u2013 68.2 degrees = 21.8 degrees.<\/span><\/strong><\/span><\/p>\n For a 5-minute gradient, the right angle of 63.4 degrees is 90 degrees \u2013 63.4 degrees = 26.6 degrees.<\/span><\/strong><\/span><\/p>\n A 6-minute gradient and a right angle of 59.0 degrees result in 90 degrees \u2013 59.0 degrees = 31.0 degrees<\/span><\/strong><\/span><\/p>\n A 10% slope; the right angle of 45.0 degrees is 90 degrees \u2013 45.0 degrees = 45.0 degrees<\/span><\/strong><\/span><\/p>\n That's how it works.<\/p>\n I'm sure there are other ways to calculate this, but this method works too.<\/p>\n It\u2019s really no big deal once you get the hang of it, but I\u2019m actually embarrassed to think that I used to draw things in CAD and measure the angles myself before I figured it out lol.<\/span><\/p>\n Please follow the design specifications regarding decimal places. If you round them off on your own, you'll get in trouble, lol.<\/p>\n <\/p>\n See you later.<\/p>\n![\"Slope\"](\"http:\/\/stat.ameba.jp\/user_images\/20140421\/18\/enta-d\/af\/0c\/j\/o0540046012915829848.jpg?caw=800\")
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