Question

A car has a two wipers which do not overlap. Each wiper has a blade of length 21cm sweeping through an angel of 120°. Find the total area cleaned at each sweep of the blades.

Answer 1

Length of viper is 21 cm

r=21 cm

θ =120°

area of sector=θ /360 × pie r^2

=120/360 × 22/7 × 21 ×21

= 3×22×3×21

=4158 cm square

The answer is, the are swept by each blade is 4158 cm square

Answer 2

Answer:

radius=21cm

and angle thita is=120cm

area swept by wiper =area of the sector

thita=120, r=21cm

aeaof sector =thita /360 ×πrsquare

area of sector = 120/360×22/7×21×21

area of sector=462cm2

and than we have to find total area

the both sector are having same value that's why we have to multiply area of sector with 2.

total area =2×462

total area=924cm2

ans

Step-by-step explanation:

I think this will definitely help u.

if u r happy with this solution than only thank me.

and for your kind information

above one is wrong solution.