Post on 14-Dec-2015
transcript
What is an angel?…I mean ANGLE!
Two rays with a common endpoint form an angle
Supplementary & Complimentary Angles
Two angles are supplementary if they add up to 180° - forming a straight line
Two angles are complimentary if they add up to 90°
Exterior and Interior Angles
Interior angles are inside of the shape Exterior angles are formed when a line
of a shape is extended
The exterior and interior angle in the picture are an example of angles.
Complimentary
Supplementary
94%
6%
1. Complimentary2. Supplementary
Pop Quiz: A triangle has sides and angles.
Two
Three
Four
Five
6%0%
6%
89%
1. Two 2. Three 3. Four4. Five
Pop Quiz: The three interior angles of a triangle add up to how many degrees?
90° 180°
360°
17%11%
72%1. 90°2. 180°3. 360°
Types of Angles
1. Right AngleAn angle formed by perpendicular lines, line segments or rays with a measure of exactly 90°
2. Acute angleAn angle that has a measure greater than 0° and less than 90°
3. Obtuse angleAn angle whose measure is greater than 90° and less than 180°
When painting, a ladder would be set to form a(n) angle with the ground.
Right
Obtu
se
Acute
19%
56%
25%
1. Right2. Obtuse3. Acute
Naming Triangles Using Angles
1. Right triangle A triangle with one right angle
2. Obtuse triangle
A triangle that has one obtuse angle
3. Acute triangleA triangle in which all three angles are
acute
Classify the triangle based on its angle measures.
Right T
riangle
Obtu
se Tria
ngl...
Acute Tria
ngle
95%
5%0%
1. Right Triangle2. Obtuse Triangle3. Acute Triangle
An obtuse triangle has one angle with a measure greater than 90° and two angles that are less than 90°
True
False
43%
57%
1. True2. False
In a right triangle, the two acute angles are…
Complimentary
Supplementary
22%
78%1. Complimentary2. Supplementary
Classifying triangles by side lengths
1. Scalene triangle
A triangle with no congruent sides
or angles
2. Isosceles triangle
A triangle with two congruent sides
and angles
3. Equilateral / Equiangular
triangle
A triangle with three congruent sides and angles
Classify the triangle.
Scalene
Isosce
les
Equila
tera
l
0%
95%
5%
1. Scalene2. Isosceles3. Equilateral
Classify the triangle.
Acute Is
oscele...
Obtu
se Is
oscel...
Acute Sc
alene
Obtu
se Sca
lene
19%
38%
19%
25%
1. Acute Isosceles2. Obtuse
Isosceles3. Acute Scalene4. Obtuse Scalene