Page 149 - Math Course 3 (Book 2)

Circles: Parts and Circumference

Circle M has diameters BG and DN. If DM = 29, MO. 11 - L1c
find DN.
Finding the Circumference

A.7.25 of a Circle
B.14.5 B D
C.29
D.58 Vocabulary A-Z
M F
Let us learn some vocabulary

N G circumference
Answer
The circumference of a circle is the distance around
the circle. Circumference is most often represented
by the letter C.
Circle M has diameters BG and DN. If MF = 8.5, C
find MG. circumference

A. 4.25
B. 8.5
C. 17
D. 85

Pi (π)
Answer
By definition, the ratio is an irrational number called
pi, symbolized by the Greek letter π.
Find Measures in Intersecting Circles

The diameters of ⊙D, ⊙B, and ⊙A are 4 inches,
9 inches, and 18 inches respectively. Find AC.

A. 2.5 in. circumference Diameter radius
B. 4.5 in.
C. 6.5 in. D B A
D. 9 in. C E

Circumference = π = 3.14159...
Answer Diameter

The diameters of ⊙D, ⊙B, and ⊙A are 5 inches,
9 inches, and 18 inches respectively. Find EB.
Key Concept

A. 13.5 in.
B. 15.5 in. Circumference
C. 13 in.
D. 12.5 in. For a circumference of C units and a diameter of d
units or a radius of r units, C = πd or C = 2πr.

Answer

141