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Polygons
The information in this section is presented using screen shots from the
StudyCards
™
and Cabri Jr. Apps for the TI-84 Plus Silver Edition.
Circles
This section features the Cabri Jr. App for the TI-84 Plus Silver Edition.
Diameter = 2*(radius)
Circumference =
π
*(diameter)
Circle Area =
π
*(radius)
2
Diameter Chord
Area
Circle’s
Equation
Lines
Creation of primitive geometric objects
as Points, Lines, Line Segments and many
others is fun and easy using the Cabri Jr.
™
App for the TI-84 Plus Silver Edition.
Triangles
This section features the Cabri Jr. App for the TI-84 Plus Silver Edition.
Equilateral: all sides and angles equal
Isosceles: two sides and angles equal
Right: one 90 degree angle
Pythagorean Theorem
Example: Draw an Isosceles Triangle
Angles
Geometric Formulas
All Perimeters
P = a+b+c+ ...
Square
Perimeter P = 4s
Area A = s
2
Rectangle
Perimeter P = 2l+2w
Area A = lw
Circle
Circumference C = 2
π
r
Area A =
π
r
2
Triangle
Perimeter P = a+b+c
Area A = bh
Parallelogram
Perimeter P = a+b+c+d
Area A = bh
Trapezoid
Perimeter P = a+b+c+d
Area A = (a+b)h
2
Rectangular Prism
Surface S = 2(hl+lw+hw)
Volume V = lwh
Sphere
Surface S = 4
π
r
2
Volume V = 4
π
r
3
3
Right Circular Cylinder
Lateral
Surface S = 2
π
rh
Total
Surface S = 2
π
rh + 2
π
r
2
Volume V =
π
r
2
h
Right Circular Cone
Lateral
Surface S =
π
r
√
r
2
+h
2
Total
Surface S =
π
r
√
r
2
+h
2
+
π
r
2
Volume V =
π
r
2
h
Frustum of a Cone
Volume V =
π
h(r
2
+rR+R
2
)
Circular Sector
Area A = r
2
Circular Ring
Area A =
π
(R
2
–r
2
)
education.ti.com/CabriJr
© Texas Instruments, 2007
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Geometry with the TI-84 Plus Silver Edition
1. Create a segment
2. Find the middle of
the segment
3. Trace a
perpendicular
line crossing the
middle point
4. Trace a triangle
using the two
existing points of
the segment and
a point on the
perpendicular line
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