plss answer all of these with explanation i will mark brainliast
Answers
Answer:
Ques:1)a) Radius=14cm
Circumference of circle=2πr
Circumference of circle=2*22/7*14
Circumference of circle=2*22*2 (Cancelling 7 and 14)
Circumference of circle=88cm
b) Radius=28mm
Circumference of circle=2πr
Circumference of circle=2*22/7*28
Circumference of circle=2*22*4 (Cancelling 7 and 28)
Circumference of circle=176mm
c) Radius=21cm
Circumference of circle=2πr
Circumference of circle=2*22/7*21
Circumference of circle=2*22*3 (Cancelling 21 and 7)
Circumference of circle=132cm
Ques:2) Circumference of circular sheet=154m
Radius=?
Circumference of circle=2πr
154=2*22/7*r
154/2=22/7*r
77=22/7*r
77*7/22=r
r=7*7/2
r=49/2
r=24.5m
Hence, radius of circular sheet=24.5m
Ques:3) Diameter of table cover=1.5m
Radius= Diameter/2=1.5/2=0.75m
Length of lace required=Circumference of circle
Circumference of circle=2πr
Circumference of circle=2*3.14*0.75 (π=3.14)
Circumference of circle=1.5*3.14
Circumference of circle=4.71m
Hence, length of lace required=4.71m
Cost of 1m of lace= Rs.15
Cost of 4.71m of lace= 4.71*15
Cost of 4.71m of lace=Rs. 70.65
Hence, cost of required lace= Rs. 70.65
Hope its clear!!!
Plz mark me as BRAINLIEST if u think its ryt :)
Answer:
Ques:1)a) Radius=14cm
Circumference of circle=2πr
Circumference of circle=2*22/7*14
Circumference of circle=2*22*2 (Cancelling 7 and 14)
Circumference of circle=88cm
b) Radius=28mm
Circumference of circle=2πr
Circumference of circle=2*22/7*28
Circumference of circle=2*22*4 (Cancelling 7 and 28)
Circumference of circle=176mm
c) Radius=21cm
Circumference of circle=2πr
Circumference of circle=2*22/7*21
Circumference of circle=2*22*3 (Cancelling 21 and 7)
Circumference of circle=132cm
Ques:2) Circumference of circular sheet=154m
Radius=?
Circumference of circle=2πr
154=2*22/7*r
154/2=22/7*r
77=22/7*r
77*7/22=r
r=7*7/2
r=49/2
r=24.5m
Hence, radius of circular sheet=24.5m
Ques:3) Diameter of table cover=1.5m
Radius= Diameter/2=1.5/2=0.75m
Length of lace required=Circumference of circle
Circumference of circle=2πr
Circumference of circle=2*3.14*0.75 (π=3.14)
Circumference of circle=1.5*3.14
Circumference of circle=4.71m
Hence, length of lace required=4.71m
Cost of 1m of lace= Rs.15
Cost of 4.71m of lace= 4.71*15
Cost of 4.71m of lace=Rs. 70.65
Hence, cost of required lace= Rs. 70.65
Hope its clear!!!
Plz mark me as BRAINLIEST if u think its ryt :)