Advertisements
Advertisements
प्रश्न
A strip of 4 cm wide is cut and removed from all the sides of the rectangular cardboard with dimensions 30 cm × 20 cm. Find the area of the removed portion and area of the remaining cardboard
Advertisements
उत्तर
Area of the outer rectangular cardboard
= L × B sq.units
= 30 × 20 cm2
= 600 cm2
Width of the stip = 4 cm
Length of the inner rectangle = L – 2W
l = 30 – 2(4)
= 30 – 8
l = 22 cm
Breadth of the inner rectangle B = 2W
= 20 – 2(4)
= 20 – 8
b = 12 cm
Area of the inner rectangle = l × b sq.units
= 22 × 12 cm2
= 264 cm2
Area of the remaining cardboard = 264 cm2
Area of the removed portion = Area of outer rectangle – Area of the inner rectangle
= 600 – 264 cm2
Area of the removed portion = 336 cm2
APPEARS IN
संबंधित प्रश्न
A circular carpet whose radius is 106 cm is laid on a circular hall of radius 120 cm. Find the area of the hall uncovered by the carpet
A school ground is in the shape of a circle with radius 103 m. Four tracks each of 3 m wide has to be constructed inside the ground for the purpose of track events. Find the cost of constructing the track at the rate of ₹ 50 per sq.m
A rectangular garden has dimensions 11 m × 8 m. A path of 2 m wide has to be constructed along its sides. Find the area of the path
A picture is painted on a ceiling of a marriage hall whose length and breadth are 18 m and 7 m respectively. There is a border of 10 cm along each of its sides. Find the area of the border
A canal of width 1 m is constructed all along inside the field which is 24 m long and 15 m wide. Find (i) the area of the canal (ii) the cost of constructing the canal at the rate of ₹ 12 per sq.m.
The formula to find the area of the circular path is
The formula used to find the area of the rectangular path is
The formula to find the width of the circular path is
A cow is tethered with a rope of length 35 m at the centre of the rectangular field of length 76 m and breadth 60 m. Find the area of the land that the cow cannot graze?
A path 5 m wide runs along the inside of the rectangular field. The length of the rectangular field is three times the breadth of the field. If the area of the path is 500 m2 then find the length and breadth of the field
