Download Discovering Geometry Day 2

Discovering Geometry
Day 2
1.2 Poolroom Math
o Daily Openers
o Check homework
1.2 Poolroom Math
angle – two rays with a common endpoint. Rays cannot be collinear.
vertex – the common endpoint of the two rays.
sides – the two rays of the angle.
Ex. Name the angle in different ways.
Ex. Name all the angles in the figure.
measure of an angle – smallest amount of rotation from one ray to the other.
– measured in degrees.
– by definition its measure would be between 0° and 180°
reflex measure – largest rotation less than 360° between two rays.
Ex. Find the measure of the angle, and its reflex measure.
 Have students draw a few angles and measure them. Have students come to the overhead and measure
the angles that I have drawn.
congruent – two angles that have equal measure.
angle bisector – a ray that passes through the vertex of an angle and divides the angle into 2  ’s.
 Review incoming angle and outgoing angle on page 41
 m incoming = m outgoing
Homework – pages 42–45 #1–40 all
Daily Openers – 1. Simplify:
2. Simplify:
180
4
3
3. Find the slope of the line: 10y – 24x = -70
4. Solve: 43x  8  52x  4  16
5. Solve:
4x  9 y  1
6 y  4 x  2