This math topic focuses on finding the outer radius of a donut-shaped figure, given its area and inner radius. This is part of introductory geometry, specifically concerning circle areas, sectors, and circular segments (often termed "donuts"). Each question provides a specific inner radius and total area, and the challenge is to determine the donut's outer radius. Options for the outer radius are given as multiple-choice answers, requiring an understanding of how to manipulate the formulas for the area of a circle to solve for the outer radius.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
morePractice:
Circle Donut From Inner Radius and Area to Outer Radius (Closest Integer)
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Find the outer radius of the donut with an area of 40.84 and an inner radius of 6
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Area of a Circle Donut From Inner Radius and Area to Outer Radius (Closest Integer) Worksheet
| Math worksheet on 'Area of a Circle Donut From Inner Radius and Area to Outer Radius (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/ |
| Find the outer radius of the donut with an area of 150.8 and an inner radius of 4 |
| 4 |
| 9 |
| 8 |
| 2 |
| 5 |
| 13 |
| Find the outer radius of the donut with an area of 37.7 and an inner radius of 2 |
| 1 |
| 4 |
| 2 |
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| 3 |
| 13 |
| Find the outer radius of the donut with an area of 75.4 and an inner radius of 1 |
| 2 |
| 3 |
| 10 |
| 5 |
| 4 |
| 8 |
| Find the outer radius of the donut with an area of 21.99 and an inner radius of 3 |
| 8 |
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| 10 |
| 9 |
| 1 |
| 4 |
| Find the outer radius of the donut with an area of 172.79 and an inner radius of 3 |
| 1 |
| 15 |
| 2 |
| 17 |
| 5 |
| 8 |
| Find the outer radius of the donut with an area of 100.53 and an inner radius of 7 |
| 18 |
| 4 |
| 9 |
| 1 |
| 3 |
| 14 |
| Find the outer radius of the donut with an area of 141.37 and an inner radius of 2 |
| 7 |
| 1 |
| 16 |
| 2 |
| 14 |
| 15 |