1. 7.G.5 ~ Find measures of angles formed by intersecting lines

2. When two lines intersect, they form a 360º angle, or a circle.

3. Half of a circle is a straight line, or 180º.

4. Vertical angles are always EQUAL!
When two lines intersect, they form two pairs of opposite angles, A + C and B + D. Another word for opposite angles are vertical angles.
Vertical angles are always EQUAL!

5. Adjacent angles are angles that come out of the same vertex
Adjacent angles are angles that come out of the same vertex. Adjacent angles share a common ray and do not overlap.

6. Two angles are said to be complementary when the sum of the two angles is 90°.

7. Two angles are said to be supplementary when the sum of the two angles is 180°, or form a straight line.

8. Find the value of x. Then find the value of each angle.
56°
84°

9. Find the value of y.
y = 9

10. Find the value of x. Then find the value of each angle.
33°
57°

11. Find the value of x. Then find the value of each angle.
113°
X = 17
67°

12. Find the missing angles:
50°
58°
40°
90°
50°

13. Now, let’s do some practice with angles!