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# MENSURATION

CONTENT

(a) Length of arcs of circle.

(b) Perimeter of sectors and segments.

(c) Areas of sectors of a circle.

(d) Areas of segments of a circle.

DEFINITION AND MEANING, LENGTH OF ARCS OF CIRCLE

(i) AN ARC: an arc of a circle is a part of the circumference of the circle.

Hence, an arc is a length or a distance along the circumference of a circle. It is never an area.

(ii) A SECTOR: a sector is a part or a fraction of a circle bounded by an arc and two radii.

Hence, an arc is a length whereas the sector covers an area of a circle.

(iii) A SEGMENT: The segment of a circle is the part cut off from the circle by a chord. A chord is the line segment AB.

LENGTH OF ARCS OF CIRCLES

If 5 sectors are cut off from 5 different circles and the lengths of the arcs l, radii r and angles θ measured and compared.

Lesson tags: General Mathematics Lesson Notes, General Mathematics Objective Questions, SS1 General Mathematics, SS1 General Mathematics Evaluation Questions, SS1 General Mathematics Evaluation Questions Third Term, SS1 General Mathematics Objective Questions, SS1 General Mathematics Objective Questions Third Term, SS1 General Mathematics Third Term
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