trignometric ratios of complementary angles

1. GOOD MORNING
CHILDREN

2. (1) What do you mean by
complementary angles?
(1) Look at the figure ;now answer
(I) <A+<B+<C =……..180
(ii) <B = …….90
(iii) <A+<C =……..
90
(2) Are <A & <C complementary ?
Ans. yes

3. ANOUNCEMENT OF THE TOPIC:
TRIGONOMETRIC RATIOS OF
COMPLEMENTARY ANGLES

4. 1. IF <C = Ө
2. THEN <A = ?
ANS. <A = (90-Ө)Ө

5. Ө
1. sin Ө = AB / AC
2. cos Ө = BC / AC
3. Tan Ө = AB / BC
4. cosec Ө = AC / AB
5. sec Ө = AC / BC
6. Cot Ө = BC/AB
1.sin(90- Ө) = BC / AC
2.cos(90-Ө) = AB / AC
3. Tan(90- Ө) = BC / AB
4.cosec (90-Ө) = AC / BC
5. sec(90- Ө) = AC / AB
6. cot(90- Ө) = AB / BC

6.  sin Ө = cos(90-Ө)
 cos Ө = sin(90- Ө)
 Tan Ө = cot(90- Ө)
cosec Ө = sec(90- Ө)
sec Ө = cosec (90-Ө)
Cot Ө = Tan(90- Ө)
TRIGONOMETRIC RATIOS OF COMPLEMENTARY ANGLES

7. PREPARED BY:
PAMMI KISHORE
TGT (MATHS)
JNV EAST GODAVARI