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Geometry Honors Unit 2: Intro to Geometry 1.6 Coordinate Plane, Midpoint, Distance 1.4 Measuring segments and angles
Agenda
1. HW Check – Please have it out when the bell rings!!!!
2. Warm-Up 3. 1.6 Distance/Midpoint 4. 1.4 Measuring segments and angles 5. Homework
Homework Check
Using horizontal and Vertical Lines only: How far is point A from point B?
Is this the Shortest
Distance?
How many ways Can I find the
Shortest distance?
Distance:
**Remember: AB = distance between A and B** AB = length of
= segment between A and B (Notation)
Distance: on a # line: on a coordinate plane: Pythagorean Theorem or in 3-d:
Examples:
1. Find RS for R(2,3) and S(-4,7)
4. Find ST for S(2, 3, 4) and T(-1, 3, 2).
What value is in the middle of A and B?
Midpoint: the value in the middle of a segment
On a # line: On a coordinate plane: In 3-d:
2. Find the coordinates of the midpoint of where R(2,3) and S(-4,7).
3. Find the coordinates of the midpoint ST for S(2, 3, 4) and T(-1, 3, 2).
1-4 Measuring Angles
Angle: is formed by two rays with the same endpoint.
The rays are the SIDES of the angle. The endpoint is the VERTEX of the angle.
EX NAMES:
Protractor Postulate
m<COD =
Acute Angle
Measures greater than and less than
Right Angle
Measures exactly
Obtuse Angle
Measures greater than and less than
Straight Angle
Measures exactly
Adjacent Angles
Angles that are beside each other and share a common ray as one of their sides.
______ and _______ are adjacent angles.
Linear Pair Are adjacent angles whose non-common sides
are opposite rays. Opposite Rays: A Linear Pair is:
**If two angles are a linear pair, then their sum is
Congruent Angles
Are angles that have the same measure.
Angle Addition Postulate
Angle Bisector Is a ray that divides an angle into two angles. ____ bisects _____, therefore ______________
Examples: 1. 2. 3.
3-d Coordinate Plane! Find the coordinates for: O N K J M H L I
Mini-Project!
� Will count as 3 classwork grades � Distance and Midpoint Trip � Due Tuesday, Sept 18 – Test day – Can
turn in early at any point
Homework
Worksheet
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