Question

A car has two wipers which do not overlap each wiper has a blade of length 25 cm sweeping throgh an angle of 115 find the total areacleaned

Answer 1

Sinve both wiper have same radius... They are the part of the same circle
Angle made by 1 wiper is 115
Angle made by both supers is 115+115=230
To find... Area of sector of angle 230 and radius 25cm
Area of sector =
$\pi \: r ^{2} theta \: \div 360$
=> 22/7 x 25 x 25 x 230/360
22/7 x 625 x 23/36
=1254.96m sq.

Answer 2

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ᴀ ᴄᴀʀ ʜᴀs ᴛᴡᴏ ᴡɪᴘᴇʀs ᴡʜɪᴄʜ ᴅᴏ ɴᴏᴛ ᴏᴠᴇʀʟᴀᴘ ᴇᴀᴄʜ ᴡɪᴘᴇʀ ʜᴀs ᴀ ʙʟᴀᴅᴇ ᴏғ ʟᴇɴɢᴛʜ 25 ᴄᴍ sᴡᴇᴇᴘɪɴɢ ᴛʜʀᴏɢʜ ᴀɴ ᴀɴɢʟᴇ ᴏғ 115 ғɪɴᴅ ᴛʜᴇ ᴛᴏᴛᴀʟ ᴀʀᴇᴀᴄʟᴇᴀɴᴇᴅ

$\huge{\orange{\underline{\red{\mathscr{@nswer:-}}}}}$

$\sf\pink{Angle\:made\:by\:each\:blade\:=\:115°}$

$\sf\red{.°.\:Total\:area\:of\:the\:sector\:with\:radius\:25cm\:and\:angle\:115°+\:115°\:=\:230}$

$\implies$$\sf\purple{x/360\:×\:πr^2}$

$\implies$$\sf\green{230/360\:×\:22/7\:×\:25\:25}$

$\implies$$\sf\blue{1255\:cm^2}$