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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)
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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.
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)
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R.4.G.2
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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.
a closed figure made by joining line segments,
where each line segment intersects exactly
two others.
These are polygons!!!
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Students take turns stating and writing
responses or solutions. Record answers on
one sheet of paper.
3 sides- triangle
4 sides- quadrilateral
5 sides- pentagon
6 sides- hexagon
7 sides- heptagon
8 sides- octagon
9 sides- nonagon
10 sides- decagon
12 sides- dodecagon
Convex Polygon
Triangle
Quadrilateral
Pentagon
Hexagon
Heptagon
Number of Sides Number of
Triangles
Sum of Angle
Measures
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.
If a convex polygon has n sides, then its
interior angle sum is given by the following
equation:
S = ( n −2) × 180°
Convex Polygons
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Concave and Convex Applet
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