This math topic focuses on finding the inner radius of a donut shape given the outer radius and the total area of the donut. The topic is introduced as part of a beginner's unit on the geometry of circle areas, sectors, and donuts. Each question requires the student to calculate the inner radius using two provided pieces of information: the total area of the donut and the length of the outer radius. The answers are presented in a multiple-choice format, challenging the student to solve the problem and select the closest integer solution. This task strengthens skills in both geometry and algebraic manipulation.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Find the inner radius of the donut with an area of 75.4 and an outer radius of 5