Question

100.5 cm = 39 cm
U65 cm
The length of the thread
the circle.
EXERCISE 21A
She perimeter of a rectangle in which:
enth = 16.8 cm and breadth = 6.2 cm
= 2 m 25 cm and breadth = 1 m 50 cm
length = 8 m 5 dm and breadth = 6 m 8 dm
AN IMPORTANT RESULT There
constant.
This result can be veriled with the h
EXPERIMENT Draw any three circles of diffu
Measure the diameter of each one of
With the help of a tape or a thread.
Record them as given below.
ad the cost of fencing a rectangular field 62 m long and 33 m wide at 16 per mette
length and the breadth of a rectangular field are in the ratio 5:3. If its perimeter
costolencing a rectangular field at 18 per metre is 1980. If the width of the Del
neth and the breadth of a rectangular field are in the ratio 7:4. The cost of fencingit
Circle
Radius
I
II
the perimeter of a square, each of whose sides measures.
WS
(1) 4.6 m
w 2 m 5 am
The putting a fence around a square field at 35 per metre is 4480. Find the lengh
och side of the field.
side of a square feld measures 21 m. Adjacent to this field. there is a rectangular de
ng its sides in the ratio 4: 3. If the perimeters of both the fields are equal, find the
dimensions of the rectangular field.
and the perimeter of
O a triangle of sides 7.8 cm, 6.5 cm and 5.9 cm.
cal an equilateral triangle of side 9.4 cm,
( an isoveles triangle with equal sides 8.5 cm each and third side 7 cm.
10 Find the perimeter of
a regular pentagon of side 8 cm.
( a regular octagon of side 4.5 cm,
(a) a regular decagon of side 3.6 cm.
11. Find the perimeter of each of the following figures:
You will find in each case that:
Circumference
= 3.14 (nearly).
Diameter
This ratio is denoted by 1 (cm
Circumference
= T
Diameter
Hence, circumferer
REMARK
Unless
EXAMPLE 1
Solut
27 cm
18 cm
12​

Answer 1

Step-by-step explanation:

are you send any question or answer