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Pairs of Angles
1.Complementary Angles
-are two angles together complete a right angle.
*The two angles need not be to be adjacent.
-to find the complement angle subtract the given angle from 90°.
Ex: Give the complement of 65°.
1. 90°-65° =25° (25+ 65=90)
2. 90°-70° =20° (20+ 70=90)
2.Supplementary Angles
-are two angles whose measurements are equal to 180°.
*The angles not also be adjacent.
-To find the supplement angle, subtract the given angle from 180°.
Ex:
1. Give the supplement of 130°.
180°-130°=50°
3.Adjacent Angles
-two angles with a common side and the same vertex.
4.Vertical angles
-are opposite angles formed two intersecting lines.
They have a common vertex but no common side.
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What are angles called where transversely line crosses two parallel lines?
Different pairs of angles have different names.
What shape has 4 equal sides and 4 different angles?
No shape has four equal sides and four different angles - either there are two pairs of equal angles, or all four angles are the same; or all sides are not the same length.
What are the values of an isosceles trapezoids angles?
An isosceles trapezoid has 2 pairs of equal angles of different sizes and they add up to 360 degrees
Can an angle have two pairs of vertical angles and two pairs of congruent angles?
No. An angle can have only one angle!
Are the angles in a quadrilateral opposite or adjacent?
- Opposite angles are two angles that don't share a side. A quadrilateral has two pairs of them. - Adjacent angles are angles that share one side. A quadrilateral has four pairs of them.
