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PK-S Lab 03 – Lab Report Name: ____________________
Section: ___________________
EXPERIMENT 3: Trigonometric Measurements
Procedures:
1. Experimental measurement of the angles and sides of a right triangle:
A. Create a triangle by taping a string against a wall and taping the bottom of the string to the floor or a table set against the wall. Make sure that the wall is perpendicular to the floor or table by measuring angle C, which should be 90o.
B. Measure sides a, b, and c of the triangle with a tape measure and record these values in centimeters (cm) on your data sheet.
C. Measure angles A and B of the triangle with a protractor and record on your data sheet.
D. Using the values for the sides of the triangle that you measured in Step B, compute angles A and B by using the different trigonometric functions.
E. Calculate the average value of the computed angle A by adding the three computed values of A and dividing by 3. Record this value on your data sheet.
F. Calculate the average value of the computed angle B by adding the three computed values of B and dividing by 3. Record this value on your data sheet.
G. Compare the values of the measured angles with the average computed values and determine their difference.
2. Determination of the sides of a right triangle when the hypotenuse and one angle are measured:
A. Create a new triangle by taping the bottom of the string to a different position on the floor or table, as in Procedure 1.
B. Measure the hypotenuse c of the triangle with a tape measure and record this value in centimeters (cm) on your data sheet.
C. Measure angle B with a protractor and record on your data sheet.
D. Calculate sides a and b of the triangle by trigonometry and record these values on your data sheet.
E. Measure sides a and b of the triangle with a tape measure and record

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