Saturday

December 20, 2014

December 20, 2014

Posted by **anna** on Monday, March 10, 2008 at 8:51pm.

I'm confused!! What is the grade of a road? Thanks for the help!

- geometrey -
**drwls**, Monday, March 10, 2008 at 8:58pmThe "grade" is the tangent of the slope angle.

arctan 0.07 = 4.00 degrees

(4 degrees is the angle whose tangent is 0.07)

- geometrey -
**anna**, Monday, March 10, 2008 at 9:04pmhow did u get the 4?

- geometrey -
**anna**, Monday, March 10, 2008 at 9:05pmnevermind my calculator was being stupid. thanks

- geometrey -
**anna**, Monday, March 10, 2008 at 9:07pmsorry one more question. so...

a road climbs at an 8 degree angle with the horizontal. what is the grade of the road?

the answer would be 5?

- geometrey -
- geometrey -
**drwls**, Monday, March 10, 2008 at 9:05pmI used the arctan key of my hand calculator. If you don't have one, you should use a table of trig functions

- geometrey -
**drwls**, Tuesday, March 11, 2008 at 8:29amThe answer to your second question is the tangent of 8 degrees. That is 0.1405, for a 14.05% grade.

You don't find many roads that steep. Driveways, maybe.

**Answer this Question**

**Related Questions**

geometry - A road climbs at an 8 degree angle with the horizontal. What is the ...

Geometry - A road climbs at an 8 degree angle with the horizontal. What is the ...

Pre-Calculus - 74. Road Grade When driving down a mountain road, you notice ...

Physics - A car with a mass of 900 kg moves along a road at a 89 km/hour at ...

Pre-Calculus-Trig - A road rises 140 feet per horizontal mile. What angle does ...

trig - A road has a 10% grade (slope). To the nearest degree what is the angle ...

math - the grade of a road is its slope given as a percent. for example, a road ...

physics - an auto, moving too fast on a horizontal stretch of mountain road, ...

Physics, HELP - AN auto, moving too fast on a horizontal stretch of mountain ...

SLOPE MATH - The grade of a road is its slope given as a percent. for example, a...