APT ACADEMIC SOLUTIONS …apt way of teaching : APT ACADEMIC SOLUTIONS …apt way of teaching AAS believes in people who deliver the right solutions, and it proudly possesses them.
Measurement of Angles : Measurement of Angles Lesson 1 TRIGONOMETRY
RECAP : RECAP Measuring Angles
Relation between degree and radian
Conversion
1. Degree to radian
2. Radian to degree www.aptacads.com
Session Objective : Session Objective Theorem
Sums related to above theorem
Introduction of Trigonometric functions www.aptacads.com
Theorem : Theorem If an arc of length l subtends an angle ? at the centre of circle with radius r, then www.aptacads.com
Slide 6 : Q 1. Find the angle in radian through which a pendulum swings if its length is 75 cm and the tip describes an arc of length 15cm.
Slide 7 : Q 2. A wire of length 49 cm is bent and lie along the circle of radius 63 cm. Find the angle subtended at the centre in degrees. www.aptacads.com
Slide 8 : Q 3. The large hand of a clock is 42 cm long. How many cms. does its extremity move in 20 minutes. www.aptacads.com
HW : HW Q 1. If the arc of the same length in two circles subtends angles 30° and 60°at their centers. Find the ratio of their radii.
Q 2. In a circus a bike is moving on a circular path of radius 100 m at the speed of 20 km/hr. Through what angle has it turned in 5 sec.
Q 3. A wheel makes 60 revolutions in a minute. Through what angle has it turn in 1 second. www.aptacads.com
Slide 10 : www.aptacads.com Trigonometric Functions
Slide 11 : Thanks www.aptacads.com