SUB TOPIC-Area of sector and segment of a circle.

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Presentation transcript:

SUB TOPIC-Area of sector and segment of a circle. LESSON PLAN CLASS-10th SUB.- MATHS TIME-35MIN. DATE-18-12-2013 TOPIC- CIRCLE SUB TOPIC-Area of sector and segment of a circle.

GENERAL OBJECTIVE 1To develop the reasoning power of the students. 2 To develop the application skill of the students. 3 To create the interest among the students.

SPECIFIC OBJECTIVES 1 TO make the students clear about circular shapes,segment and sector of circle. 2 TO make students capable of finding the area of the sector and segment of the circle.

P.K.TESTING Students are familiar with method of finding perimeter and area of simple plane such as rectangle, square, triangle and parallelogram from your earlier classes. 1. what is perimeter of square of side 4 m What is area of rectangle of length 5 m and breadth 3m Give some examples of circular objects.

MOTIVATION Cut the circle in a number of sectors and rearrange them as per fig. 2 see that the shapes of the sectors are nearly rectangles of length = ½x2πr and breadth r. Area of rectangle which is the area of the circle or radius r.

PRESENTATION

PRESENTATION

PRESENTATION

PRESENTATION Example:-1 Find the area of the sector of a circle with radius 6cm and central angle 120º Sol. Here r = 6 cm θ =120º Therefore area of sector=120x22x6x6/ 360x7=37.71cm2

HOME ASSIGNEMENT 1 Find the area of a sector of circle with radius 9cm if angle of sector is 60º 2 The length of the minute hand of a clock is 10cm. Find the area swept by the minute hand in 12 minutes.

PREPARED BY 1 DESH RAJ LECT. IN MATHS G.S.S.S. BANJAR. DISTT. KULLU. H.P. 2.SURESH KUMAR. LECT. MATHS DIET KULLU AT JARAD.