Being able to identify and compare angle can help us in this lesson. Let's try this problem to review.
Which of these angles is larger?
Choose the option with a larger turn between the lines.
The answer is option B.
Angles can be compared by how large the turn is between the lines.
Let's see how we can use angles we know to estimate other angles.
Which angle is equal to 45 degrees?
Recall that a 45\degree angle is half of a 90\degree angle, or right angle:
Option A is larger than a right angle. Option B looks smaller than half a right angle. Option C looks like half a right angle.
So the answer is option C.
If we remember some important angles, we can use those to estimate other angles.
measures and constructs angles, and applies angle relationships to find unknown angles