The radius of one circle is 9mm and the radius of a second circle is 21mm. What is the ratio of their circumferences in simplest form?
Circles and Similarity

Quiz
•
Mathematics
•
10th Grade
•
Hard
Anthony Clark
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
9:21
1:3
3:7
9:49
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The circumference of Circle A is 24π feet.
The circumference of Circle B is 4π feet.
What is the ratio of their radii in simplest form?
24:4
48:8
1:6
6:1
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Circle A has a diameter of 25m. Circle B has a diameter of x.
If Circle A has and area of 78.5 square meters and
Circle B has an area of 706.5 square meters, what is the diameter of Circle B?
(hint: draw a picture)
25 meters
9 meters
225 meters
125 meters
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the scale factor between two arcs is 5/6, then the ratio of areas is...
5:6
10:12
25:36
125:216
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The radius of one circle is 9mm and the radius of a second circle is 21mm. What is the ratio of their areas in simplest form?
9:21
1:3
3:7
9:49
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
9
3
1/3
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the part of the circle highlighted in red called?
semi-circle arc
major arc
minor arc
sector
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