1. n#. Á§fuh{, Ï.ã. MÁça®,
Cuh£Á x‹¿a¤ bjhl¡f¥gŸë, br«gu«gh¡f«, óéUªjtšè x‹¿a«.
ÂUtŸS® kht£l«
exit

2. 3
2
1
0
RECTANGLE
……………………………………………… ........
4
…………………………………………………………….......................................
0
1
2
3
4
5
6
7
8
l
b
THE AREA OF RECTANGLE
ABCD IS
THE AREA OF RECTANGLE
ABCD IS
EIGHT UNITS
FOUR UNITS
l
8
b
4
l b
32
SQUARE UNITS
SQUARE UNITS

3. l
b
RECTANGLE
b
l
l
EIGHT UNITS
b
THE AREA OF RECTANGLE
ABCD IS
THE AREA OF RECTANGLE
ABCD IS
FOUR UNITS
l
b
8 4
l b SQUARE UNITS
32 SQUARE UNITS
exit

4. 3
2
1
0
……………………………………………… ........
4
SQUARE
………………………………………………
0
1
2
3
4

5. SQUARE
a
a
a
a
SIDE OF SQUARE
AREA OF SQUARE
AREA OF SQUARE
a UNITS
a a2 SQUARE UNITS
a
4 4 16 SQUARE UNITS
exit

6. PARALLELOGRAM
BASE OF PARALLELOGRAM IS
b
b UNITS
HEIGHT OF PARALLELOGRAM
UNITS
IS
THE PARALLELOGRAM CHANGE INTO RECTANGLE
THE BASE CHANGE INTO LENGTH OF THE RECTANGLE SO
AREA OF PARALLELOGRAM IS
AREA OF PARALLELOGRAM IS
AREA OF RECTANGLE
SQUARE UNITS
b
b
exit

7. RHOMBUS
DIAGONAL
d2
DIAGONAL
AREA OF RHOMBUS IS
AREA OF RHOMBUS IS
d1
_ AREA OF THE RECTANGLE
1
2
_ d1 d2 SQUARE UNITS
1
2
exit

8. b - BASE
THE TRIANGLE CHANGE INTO RECTANGLE
AREA OF TRIANGLE
AREA OF RECTANGLE
BASE (
AREA OF TRIANGLE IS
1
b) _h
2
1
_
b h
2
1
_
2 b h SQUARE UNITS
exit

9. TRAPEZIUM
b
a
AREA OF TRAPEZIUM
ABCD IS
(AREA OF
1
( _ AB
(
(
AREA OF TRAPEZIUM
ABCD IS
2
_
1
2
_
1
2
a
ah)
1 (a
_
2
ABD )
ED)
h)
(AREA OF
1
( __DC
(
2
__
1
2
b
BCD)
BF)
h)
1
( __ bh)
2
b) h SQUARE UNITS
exit

10. rçtf«
b
bb
b
bb
b
M1
M2
h
E
_h
1
2
a
AREA OF TRAPEZIUM
AREA OF RECTANGLE
AREA OF TRAPEZIUM
LENGTH
AREA OF TRAPEZIUM
BREADTH
1
(a b) _
h
2
_ (a b) h SQUARE UNITS
1
2
exit

11. xU nrho g¡f§fŸ
k£L« Ïizahf
cŸs eh‰fu«
_ (a
1
2
b)
rJu
h myFfŸ
K¡nfhz§
fshf m¿jš
rçtf¤Â‹
g©òfŸ
br›tfkhf
m¿jš
rçtf¤Â‹
gu¥gsÎ
rçtf«
exit

12. n#. Á§fuh{, Ï.ã. MÁça®,
Cuh£Á x‹¿a¤ bjhl¡f¥gŸë, br«gu«gh¡f«, óéUªjtšè x‹¿a«.
ÂUtŸS® kht£l«
exit

13. t£l«
u«
M
t£lika«
P = R‰wsÎ (PERIMETER)
D=
é£l«
( DIAMETER)
é£l«
l Â
t£ gF
¿a ¥
Á hz
nf
R‰wsÎ
bgça t£l
nfhz¥gFÂ

14. t£l«
t£l eh©
t£l eh©
t£l ¤Â‹ äf¥bgça eh© ( é£l«)
t£l eh©
t£l eh©
t£l¤Â‹ ika¡nfhz« = 360 °.
t£l eh©
t£l eh©

15. t£l¤Â‹ gç¡F« é£l¤Â‰F« ÏilnaÍŸs bjhl®ò
P
2r = d
P
▬=
d
π
P = R‰wsÎ ( PERIMETER)
D =é£l« (DIAMETER)
r =Mu« ( radius)
P = PERIMETER
D = DIAMETER
~
▬
22
▬
7
~
~ 3.14
▬
▬
π

16. t£l¤Â‹ R‰wsÎ
P = R‰wsÎ
P = R‰wsÎ ( PERIMETER)
D =é£l« (DIAMETER)
r =Mu« ( radius)
2r = d
2r
t£l¤Â‹ R‰wsÎ
t£l¤Â‹ é£l«
t£l¤Â‹ R‰wsÎ
t£l¤Â‹ R‰wsÎ
t£l¤Â‹ R‰wsÎ
t£l¤Â‹ R‰wsÎ
=π
= π × t£l¤Â‹ é£l«
=π×d
=π×
= 2πr rJu myFfŸ
P
▬=
d
π

17. P
▬
2
D
P
▬
2
P
▬
2
ABC
D
P
▬ ×r
2
r
Multiply by ‘r’ on both side of
numerator and denominator
=
C
P
▬ ×r×r
2r
2r = d
r
r
A
=
AREA OF
=
AREA OF
=
B
AREA OF
P
▬ ×
d
r2
P
▬=
d
π
= πr² s q units

18. P
▬
2
miu t£l¤Â‹ R‰wsÎ
miu t£l¤Â‹ ika¡nfhz« 180 °
A
miut£l¤Â‹ R‰wsÎ
R‰wsÎ (P)
180 °
= (½ ×
r
t£l¤Â‹ gç )
Mu«)
P
=
(½ × 2πr )
P
=
+
(πr +2r ) =
myFfŸ.
miut£l¤Â‹
R‰wsÎ
= (
π + 2) r
r
o
+
(2
×
2r
( π + 2) r
r
r myFfŸ.
B

19. P
▬
2
miu t£l¤Â‹ gu¥gsÎ
A
miut£l¤Â‹ gu¥gsÎ
miut£l¤Â‹ gu¥gsÎ (A)
=
½ ×
r
t£l¤Â‹ gu¥gsÎ
= ½ × πr²
πr²
miut£l¤Â‹ gu¥gsÎ (A)
=
r
▬ rJu myFfŸ.
2
B

21. P
▬
4
fhš t£l¤Â‹ R‰wsÎ
r
fhš t£l¤Â‹ ika¡nfhz« 90 °
A
fhš t£l¤Â‹ R‰wsÎ
R‰wsÎ (P)
= (¼ ×
t£l¤Â‹ gç )
Mu«)
P
=
( ¼ × 2πr )
P
=
▬
(πr +2r ) =
myFfŸ.
miut£l¤Â‹
R‰wsÎ
2
▬
2
= (
B
+
▬
(
2
π + 2) r
+
r
90 °
o
(2
×
2r
π + 2) r
r
r myFfŸ.

22. P
▬
4
fhš t£l¤Â‹ gu¥gsÎ
B
r
A
r
90 °
o
fhš t£l¤Â‹ gu¥gsÎ
=
¼ × t£l¤Â‹ gu¥gsÎ
=
fhš t£l¤Â‹ gu¥gsÎ (A)
¼
× πr²
πr²
fhš t£l¤Â‹ gu¥gsÎ (A)
=
▬ rJu myFfŸ.
4

28. r®trk K¡nfhz§fŸ

29. A
R
PP
R
R
B
P
Q
Q
Q
A
P
B
Q
C
R
R
PC
Q
gf;fk; AB = gf;fk; PQ;
gf;fk; BC = gf;fk; QR
gf;fk; CA = gf;fk; RP
Nfhzk; A = Nfhzk; P
Nfhzk; B = Nfhzk; Q
Nfhzk; C = Nfhzk; R

30. SSS – mo¥gil¡ bfhŸif
A
B
S – g¡f«
A – nfhz«
D
C E
F

31. S
P
R
Q

32. SAS – mo¥gil¡ bfhŸif
D
A
A
B
S – g¡f«
A – nfhz«
C
E
B
F
C

33. A
B
B
C
A
3–b
rÛ
7–
7– brÛbrÛ
brÛ
–
300
300
300
7– brÛ
7– br Û
7– brÛ
3
C
A
3 – brÛ
rÛ
300 – b
3
A
br
Û
B
7–
300
3
30
0
B
C
C
Û
7– br
C
B
br Û
–
A
B
B
3 –A
3–
A
Û
br
Û
br
300
C
C

34. A
brÛ
3–
3–
b
D
rÛ
D
3
brÛ–brÛ
6–
o
o
o
Û
B
C
rÛ
3–
–b
brÛ 6
6
– br
Û
–br
6
C
D
C

35. ASA – mo¥gil¡ bfhŸif
A
A
B
S – g¡f«
A – nfhz«
C
B
C

36. RHS – mo¥gil¡ bfhŸif
D
A
B
C
E
F

37. D
A
F
BE
D
C
E
F

38. FOR FURTHER DETAILS SEE THE WEB SITE OF
www.whiteboardmaths.com