Presentation on theme: "Mathematic Skills 1. Determine - area of sector radius - the radius - the angle subtended center of a circle 2. Find the area of segment of circle Prior."— Presentation transcript:
Mathematic Skills 1. Determine - area of sector radius - the radius - the angle subtended center of a circle 2. Find the area of segment of circle Prior Knowledge The students already learnt - how to convert measurement in radians to degrees and vice versa. ow to determine the length of arc, radius and angle subtended at the centre of a circle. - how to find the perimeter of the segment of circle.
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 a circle. - answer the quiz 100% correctly. - answer at least 3 out of 5 questions given in the worksheet correctly. CONNECT TO LESSON PLAN
Area of Sector Area Radius Angle Worksheets Quiz
What is Area Sector of circle??? Like that???
This is a circle with center O. And this is a circle with sector AOB. The area shaded blue color names as Area AOB. O
A B O r cm A=Area Shaded r = radius A
r=4 cm 270 o O 1.Diagram below shows a circle with 4cm radius and angle 270 o, find the shaded area. Given r=4cm, angle = 270 o
2. Find the angle of the sector AOB in radiant. = 270o x
3. Diagram above shows a sector AOB with center O made from wire length 90cm, the length of arc OAB is 50cm, find : - (a) the angle in radiant (b)The area of sector AOB = 270o x Given r = r cm Perimeter = 90cm Arc AB + OA + AB = 90cm 50 + r + r = 90cm 2r = 40 r = 40
4. A circle sector with area 25.2cm 2 and the angle at the centre is 1.4rad. Find the radius of the circle.