6.3 surface area of pyramids and cones 6-3 day 2 3...3 the lateral faces of a regular pyramid can be...
TRANSCRIPT
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6.3 Surface Area of Pyramids and Cones
OBJECTIVE: Determine the surface areas and lateral areas of pyramids and cones.
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The vertex of a pyramid is the point opposite the base of the pyramid. The base of a regular pyramid is a regular polygon, and the lateral faces are congruent isosceles triangles.
The slant height of a regular pyramid is the distance from the vertex to the midpoint of an edge of the base. The
altitude of a pyramid is the perpendicular segment from the vertex to
the plane of the base.
6.3 Surface Area of Pyramids and Cones
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The lateral faces of a regular pyramid can be arranged to cover half of a rectangle with a
height equal to the slant height of the pyramid. The width of the rectangle is equal to the base
perimeter of the pyramid.
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L = PhS = L + 2B
S = Ph + 2B
S cube = 6s2
S =Surface Area
L =
P = perimeter of baseB = area of base
h = height of prismr = radius
L = 2πrh S = L + 2πr2
S = 2πrh + 2πr2
V = Bh
V rect prism = lwhV cube = s3
V = BhV = πr2h
L = ½PlS = ½Pl + B
S = L + B
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Find the lateral area and surface area of a regular square pyramid with base edge length 14 cm and slant height 25 cm. Round to the nearest tenth, if
necessary.
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Find the lateral area and surface area of the pyramid.
HINT:Use the Pythagorean Theorem to find ℓ.
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Find the surface area of the composite figure.
Surface Area of Cube without the top side:
Surface Area of Pyramid without
base:
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HOMEWORK:# 82 Pyramid WorksheetL & S