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1.3 QUIZ Answers
1.3 QUIZ Answers
1.6 SA and Volume of a Sphere
What is a sphere?
• A set of points in space
• These points are the same distance from
the centre• The distance from the
centre to an point on the sphere is called
RADIUS• The distance from one
point to another (through the centre) is
called DIAMETER
Surface Area of a Sphere
• SA of sphere is related to the curved surface of a cylinder
REMEMBER??
= h
Surface Area of a Cylinder
Base 12 circular bases
Base 2
Curved surface is a rectangle
Curved Surface
SA of the curved surface of cylinder is
2πr ·𝐡2πr · 2r
= h
Surface Area of a Cylinder
SA of the curved surface of cylinder is
2πr ·𝐡2πr · 2r
= h
Surface Area of a Sphere
The diameter of a baseball is approximately 3 in. Determine the surface area of a baseball to the nearest square inch.• Use the formula for the surface
area of a sphere• The radius is = 1.5 in.
The surface area of a baseball is approximately 28 square inches.
POWERPOINT PRACTICE PROBLEMThe surface area of a soccer ball is
approximately 250 square inches. What is the diameter of a soccer ball to the nearest
tenth of an inch?
Volume of a Sphere
The sun approximates a sphere with diameter 870 000 mi. What is the approximate volume of the sun?• Use the formula for the VOLUME of a
sphere• The radius is = 435 000 miles
The volume of the sun is approximately
3.4 × 1017 cubic miles (mi3).
HemisphereWhen a sphere is cut in half….
What is the SURFACE AREA of a Hemisphere?
What is the VOLUME of a Hemisphere?
A hemisphere has radius 8.0 cm.a) What is the surface area of the hemisphere to
the nearest tenth of a square centimetre?b) What is the volume of the hemisphere to the
nearest tenth of a cubic centimetre?
The surface area of the hemisphere is approximately 603.2 cm2.
The volume of the hemisphere is
approximately 1072.3 cm3.
POWERPOINT PRACTICE PROBLEMA hemisphere has radius 5.0 cm.a) What is the surface area of the hemisphere to the nearest tenth of a
square centimetre?b) What is the volume of the hemisphere to
the nearest tenth of a cubic centimetre?
HOMEWORKOPAGES: 51 - 52
OPROBLEMS:7, 8, 10, 13, 16, 18