Ch 11 covers areas and perimeters of sectors, segments, and combined figures involving circles. Students solve problems on areas of regions enclosed between circles and other shapes.
A sector is the region between two radii and the arc. Area of sector = (θ/360°) × πr². Length of arc = (θ/360°) × 2πr. A segment is the region between a chord and its arc. Area of segment = area of sector − area of triangle.
Many problems involve finding areas of regions formed by combining or subtracting basic shapes (circles, rectangles, triangles). Strategy: identify the basic shapes, calculate each area, then add or subtract as needed.
Download: https://ncert.nic.in/textbook/pdf/jemh111.pdf | Complete book: https://ncert.nic.in/textbook/pdf/jemh1ps.zip
A sector is bounded by two radii and an arc (like a pizza slice). A segment is bounded by a chord and an arc. Sector = triangle + segment (for minor segment).
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