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Area of a Circle Donut From Both Radii to Area (Closest Integer) (Level 1)

This math topic centers on calculating the area of a "circle donut" or annulus using both the inner and outer radii of the shape. Students are required to determine the area to the nearest integer. It is an introductory geometry task that falls within the study of circle areas, sectors, and donuts. The exercises involve a specific focus on the mathematical procedures needed to subtract the area of the smaller inner circle from the larger outer circle, using the formula for the area of a circle, πr². Each question presents unique radii measurements and multiple-choice answers.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Circle Donut From Both Radii to Area (Closest Integer)

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Find the area (to the closest integer) of the donut with outer radius 5 and inner radius 3

r=5r=3

Area of a Circle Donut From Both Radii to Area (Closest Integer) Worksheet

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Math worksheet on 'Area of a Circle Donut From Both Radii to Area (Closest Integer) (Level 1)'. Part of a broader unit on 'Geometry - Circle Area, Sectors and Donuts - Intro' Learn online: app.mobius.academy/math/units/geometry_circles_sector_donut_area_logic_intro/
1
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 5 and inner radius 4
a
14
b
38
c
30
d
28
e
18
f
44
2
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 3 and inner radius 2
a
24
b
16
c
12
d
14
e
15
f
8
3
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 5 and inner radius 3
a
90
b
60
c
30
d
50
e
80
f
15
4
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 8 and inner radius 6
a
144
b
40
c
48
d
88
e
16
f
80
5
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 7 and inner radius 4
a
104
b
54
c
144
d
164
e
74
f
14
6
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 7 and inner radius 3
a
222
b
6
c
54
d
126
e
18
f
174
7
An svg image showing a math problem
Find the area (to the closest integer) of the donut with outer radius 5 and inner radius 2
a
6
b
66
c
24
d
54
e
78
f
18