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Subjects

Mathematics

Arc length

चाप की लंबाई

In this Class 9 Mathematics topic from the chapter Area and Perimeter, students learn how to find the length of a curved part of a circle, called an arc. They connect arc length with the circumference and central angle, use the appropriate fraction of 360°, and apply the formula in routine problems. The topic also develops accurate use of radius, diameter, π, units, and step-by-step reasoning for measuring curved boundaries in figures and everyday situations.

Practice questions

A sector has perimeter 32 cm and arc length 12 cm. What is its central angle in radians?MediumLevel 68

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