Find the slopes of RS and TS for the given points, R, T, and S. Determine whether RS and TS are perpendicular or not perpendicular.

R(4,5), S(-1,10), T(13,20)

Bell Ringer

8-1 Investigate interior and exterior angles of

polygons

Partners take turns, one solving a problem while the other coaches.

1. Partner A solves the first problem. 2. Partner B watches and listens, checks,

coaches if necessary, and praises. 3. Partner B solves the next problem. 4. Partner A watches and listens, checks,

coaches if necessary, and praises.

Rally Coach

Find the slopes of RS and TS for the given points, R, T, and S. Determine whether RS and TS are perpendicular or not perpendicular.

1. R(-9,6), S(3,8). T(1,20)2. R(-6,-1), S(5,3), T(2,5)

Rally Coach

R.4.G.2   Objective: I will find the sum of the

measures of the interior and exterior angles of polygons. I will also find the measure of each interior and exterior angle when the sides and angles are all congruent, which is called a regular polygon.

Geometry SLE

Students take turns stating and writing responses or solutions. Record answers on one sheet of paper.

Write Rally Robin

Name as many polygons as you can think of and record your answers on your sheet of paper.

Class share time!

Convex Polygon

Number of Sides

Number of Triangles

Sum of Angle Measures

Triangle

Quadrilateral

Pentagon

Hexagon

Heptagon

Types of Polygons

Benzene Molecule

The benzene molecule C6H6, consists of six carbon atoms in a regular hexagonal pattern with a hydrogen atom attached to each carbon atom. Find the sum of the measures of the interior angles of the hexagon.

The chemical compound benzene (C6H6) is a colorless, flammable, aromatic hydrocarbon, that is a known carcinogen. It boils at 80.1°C and melts at 5.5°C. Benzene has a heat of vaporization of 44.3 kJ/mol and a heat of fusion of 9.84 kJ/mol. Produced by hydrogen reduction of some allotropes of carbon, or from petroleum, it is used in the creation of drugs, plastics, gasoline, synthetic rubber, napalm and dyes.