003 savofconespryamidsplus
TRANSCRIPT
Find the lateral area and the surface area of each figure. Round to the nearest tenth, if necessary.
1. a cube with edge length 10 cm
2. a regular hexagonal prism with height 15 in. and base
edge length 8 in.
3. a right cylinder with base area 144 cm2 and a height
that is the radius
L = 400 cm2 ; S = 600 cm2
L = 720 in2; S 1052.6 in2
L 301.6 cm2; S = 1206.4 cm2
GT Geometry 5/8/14 Drill #4.13• Put hw and a pen on the corner of your desk.
4. A cube has edge length 12 cm. If the edge
length of the cube is doubled, what happens to the surface
area?
5. Find the surface area of the composite figure.The surface area is multiplied by 4.
S = 3752 m2
OBJECTIVETo define and find the
lateral area, surface area, and volume of a regular pyramid
and a cone
vocabulary • base - polygon• lateral faces - triangles• vertex - point where lateral
faces meet• altitude - segment from the
vertex perpendicular to the plane of the base
vocabulary • pyramid - a polyhedron which
consists of one base and lateral faces which are triangles
• regular pyramid - base is a regular polygon
vocabulary • right pyramid - the altitude
intersects the base at its center• oblique pyramid - the altitude
intersects the base at a point other then the center
vocabulary • slant height of a pyramid - the
length of an altitude of a lateral face.
Naming a Pyramid•Pyramids are named
according to the shape of their bases
BASE
Lateral Edge
Slant Height
Height of the object
formula The lateral area LA of a right
regular pyramid with slant height l and perimeter of a base p is
L = 1/2 l p or
LA = 1/2 l p
formula The surface area SA of a right
regular pyramid is
SA= LA + B or
S = LA + B
formula The volume V of a right regular
pyramid is
V=
B = area of the base
H = height or altitude of the object
BH3
1
How do you find the lateral area of a cone?
LA = plperimeter • slant
height
1
2
How do you find the lateral area of a cone?
How do we find the
perimeter of a circle?
How do you find the lateral area of a cone?
How do we find the perimeter of a circle?
2πr or dπ
How do you find the lateral area of a cone?
LA = 2πrlperimeter • height
1
2
How do you find the lateral area of a cone?
LA = πrlperimeter •
height
Finding the Surface Area of a cone
SA= LA + B
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Finding the Volume of a cone and pyramid
V = ?BH
Classwork( exact)Find LA,SA, V coneradius = 5 cmheight= 12 cm
Classwork (exact)Find LA, SA & V coneradius = 3 cmslant height = 6 cm
CLASSWORK • find lateral and surface
areas• right regular hexagonal
pyramid •base edge = 4cm• slant height = 5cm
CLASSWORK • find lateral and surface
areas• right regular triangular
pyramid •base edge = 6cm•height = 37 cm
CLASSWORK •Find LA & SA• rectangular pyramid •base edges =
12cm, 9cm•height = 12 cm
Classwork/Homework•P 694 #13-22•P709 #2-12