TEKS 4.7C: Approximate Angle Measures
Measure Angles Using a Protractor
About this lesson
Learning Target: I can use a protractor to measure an angle.
Focuses On:
- Measuring angles to the nearest multiple of 5 using a protractor when one ray crosses zero degrees on a protractor
- Measuring angles to the nearest multiple of 5 using a protractor when neither ray crosses zero degrees on a protractor
Builds On:
4.7A:
Illustrate the measure of an angle as the part of a circle whose center is at the vertex of the angle that is “cut out” by the rays of the angle; angle measures are limited to whole numbers.
4.7B:
Illustrate degrees as the units used to measure an angle, where 1/360 of any circle is 1 degree and an angle that “cuts” n/360 out of any circle whose center is at the angle’s vertex has a measure of n degrees; angle measures are limited to whole numbers.
Next Level:
4.7D:
Draw an angle with a given measure.
5.5A:
Classify two‐dimensional figures in a hierarchy of sets and subsets using graphic organizers based on their attributes and properties.
Read More:
This lesson is designed to support student understanding of protractors and how they can be used to measure angles.
The two instructional blocks in this lesson are protractor skills and measuring angles.
In the first instructional block, students are asked to measure angles using a protractor where one of the rays crosses the protractor at zero degrees.
The second instructional block increases in difficulty as students are then asked find the angle measurement when neither ray passes through zero degrees on the protractor.
All angle measurements in this lesson are limited to multiples of 5. Measurements are made on both the left and right side of the protractor.
Scaffolds such as pictorial representations of protractors are built into the lesson to support student understanding.
Grade 4MathTEKS 4.7C