EXTRA CREDIT: Are the stairs in your home regulation?

REMEMBER --

 The ideal ratio of riser to tread is 0.7 INV TAN 0.7 = 35° < ---ideal angle of inclination r+t = 17 inches r.t = 70 to 75 there can be no more than 3/16 of an inch variation in height of risers i a set of stairs.

I. Do stairs in your home fit these quidlines?

To find out, use a ruler to measure one riser and one tread from TWO sets of stairs in INCHES and complete the following table:

 Description of stairs riser height (in) tread length (in) SLOPE = riser/tread Angle of Inclination sum, r + t product r . t

Generally, staircases do not have to be changed if the angle of inclination is LESS than the ideal, but they do if the angle is MORE than the ideal.

Do any of the stairs in or near Aderhold need to be changed? ____________

II. RESULTS

Write a full paragraph explaining your results in the chart above. Tell

what you measured, including a description of the two sets of stairs you investigated

what you calculated

whether or not your stairs fit the guidelines of the current laws

whether, according to the angles, the stairs should be changed

III. EVALUATION

 not yet... OK master architect Calculations are accurate 1 2 3 4 5 6 Paragraph is -complete -mathematically correct -checked for correct spelling, grammar, etc. 1 1 1 2 2 2 3 3 3 TOTAL: _______/15
Slope Activity 1: Is GBS up to Code?

The Department of Mathematics Education
University of Georgia