Measurement – Dimensions
Distance measuring units include the U.S. standard, (inch, feet, yard), decimal-inch (tenth, hundredth, thousandth, ten-thousandth), or the metric (millimeter, centimeter, meter). Being able to measure length or distance, or determining if something is square are integral parts of many projects. This can include weekend do-it-yourself jobs to major landscaping and construction projects. While measuring cannot be done without some variation, errors can be reduced by following basic principles covered in this course.
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Learning Objectives
• Describe the difference between errors and mistakes as they relate to measuring
• List ways to increase measuring accuracy
• Describe the parallax error
• Identify basic unit measurements for U.S. Standard, Decimal-Inch, and International System of Units, or SI (metric)
• Describe how to measure an angle
• Differentiate between the architectural and engineering scales
• Describe how to determine if something is square
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What is variation?
The difference between one measurement and the next
How do you measure an angle?
Typically angles are measured by a device called a protractor. The protractor has a center point, base line, outer scale, and inner scale. The protractor’s center point is placed on the angle’s vertex and then rotated so that the base line is lined up with one ray of the angle. The degree of the angle can be measured by determining where the other ray intersects the appropriate scale.
How can you determine if an angle is square?
You can check with a tool called a square, you can use the 3-4-5 rule, or for an object with four corners, you can measure diagonally from corner to corner.
Sample Video Transcript
Some projects require an angle to be measured. An angle is formed when two lines meet or intersect. The angle is the space between the intersecting lines, and it is measured in degrees. The end point or spot where these lines intersect is known as the “vertex”. Typically, angles are measured by a device called a protractor. The protractor has a center point, base line, outer scale, and inner scale. The protractor’s center point is placed on the angles vertex and then rotated so that the base line is lined up with one ray of the angle. The degree of the angle can be measured by determining where the other ray intersects the appropriate scale. If the first ray passes through zero on the outer scale, read the angle on the outer scale. And if the first ray passes through zero on the inner scale, use the inner scale.
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