Five-Minute Check (over Lesson 12–2)
CCSS
Then/Now
New Vocabulary
Key Concept: Lateral Area of a Regular Pyramid
Example 1: Lateral Area of a Regular Pyramid
Key Concept: Surface Area of a Regular Pyramid
Example 2: Surface Area of a Square Pyramid
Example 3: Surface Area of a Regular Pyramid
Key Concept: Lateral and Surface Area of a Cone
Example 4: Real-World Example: Lateral Area of a Cone
Example 5: Surface Area of a Cone
Concept Summary: Lateral and Surface Areas of Solids
Content Standards
G.MG.1 Use geometric shapes, their
measures, and their properties to describe
objects (e.g., modeling a tree trunk or a
human torso as a cylinder).
Mathematical Practices
1 Make sense of problems and persevere in
solving them.
6 Attend to precision.
You found areas of regular polygons.
•  Find lateral areas and surface areas of
pyramids.
•  Find lateral areas and surface areas of
cones.
•  regular pyramid
•  slant height
•  right cone
•  oblique cone
Lateral Area of a Regular Pyramid
Find the lateral area of
the square pyramid.
Find the lateral area of the square pyramid.
Surface Area of a Square Pyramid
Find the surface area of the square pyramid to the
nearest tenth.
Find the surface area of the square
pyramid to the nearest tenth.
Surface Area of a Regular Pyramid
Find the surface area of the regular pyramid.
Round to the nearest tenth.
Lateral Area of a Cone
ICE CREAM A sugar cone has an altitude of
8 inches and a diameter of
lateral area of the sugar cone.
inches. Find the
Surface Area of a Cone
Find the surface area of
the cone. Round to the
nearest tenth.
Find the surface area of the cone. Round to the
nearest tenth.
12.3 HW:
P. 859
8-26E, 46, 48