3 Mathematic Skills1. Determine- area of sector radius- the radius- the angle subtended center of a circle2. Find the area of segment of circlePrior KnowledgeThe students already learnthow to convert measurement in radians to degrees and vice versa.how to determine the length of arc, radius and angle subtended at thecentre of a circle.- how to find the perimeter of the segment of circle.
4 Learning Outcomes:At the end of this lesson, students will be able to:find the area of sector radius, the radius and the angle subtended center of acircle.- answer the quiz 100% correctly.- answer at least 3 out of 5 questions given in the worksheet correctly.CONNECT TO LESSON PLAN
9 Diagram below shows a circle with 4cm radius and angle 270 o, find the shaded area.Given r=4cm, angle = 270 or=4 cmO270o
10 2. Find the angle of the sector AOB in radiant. = 270o x
11 = 270o xGiven r = r cmPerimeter = 90cmArc AB + OA + AB = 90cm50 + r + r = 90cm2r = 40r = 403. Diagram above shows a sector AOBwith center O made from wire length90cm, the length of arc OAB is 50cm,find : -the angle in radiantThe area of sector AOB
12 4. A circle sector with area 25. 2cm2 and the angle at the centre is 1 4. A circle sector with area 25.2cm2 and the angle at the centre is 1.4rad.Find the radius of the circle.