Page 1 - Estimating angles
P. 1
SAI International School
Class- III
LN- Estimating angles
Lesson Objectives:
By the end of this lesson, students should be able to:
1. Understand the concept of estimating angles without using a protractor.
2. Estimate angles using visual cues and reference angles.
3. Develop strategies to improve their ability to estimate angles.
4. Apply estimation techniques to real-life situations and basic geometric
problems.
What is Estimating Angles?
Estimating angles involves making an educated guess about the size of
an angle. This is done by comparing the unknown angle to known
reference angles (such as 0°, 45°, 90°, 180°, etc.).
Common Angle References:
To make good estimations, students should be familiar with key
reference angles:
• 0°: No opening (the rays are overlapping).
• 45°: Half of a right angle.
• 90°: A right angle (like the corner of a square).
• 120°: Slightly larger than a right angle.
• 180°: A straight line.
• 360°: Full rotation (a circle).
Key Steps for Estimating Angles:
1. Recognize Known Angles:
