2. The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with a
What is the length of the tape required?
3. A table-top measures 2 m 25 cm by 1 m 50 cm. What is the perimeter of the
table-top?
4. What is the length of the wooden strip required to frame a photograph of length
and breadth 32 cm and 21 cm respectively?
5. A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to be
fenced with 4 rows of wires. What is the length of the wire needed?
Answers
Answer:
2.The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of the tape required?
Answer:
Total length of tape required = Perimeter of rectangle
= 2(length + breadth)
= 2(40 + 10)
= 2 * 50
= 100 cm
= 1 m {Since 1 m = 100 cm}
Thus, the total length of tape required is 100 cm or 1 m.
3.A table-top measures 2 m 25 cm by 1 m 50 cm. What is the perimeter of the table-top?
Answer:
Length of table top = 2 m 25 cm = 2 m + 0.25 cm = 2.25 m
Breadth of table top = 1 m 50 cm = 1m + 0.50 m = 1.50 m
Perimeter of table top = 2(length + breadth)
= 2(2.25 + 1.50)
= 2 * 3.75
= 7.50 m
Thus, the perimeter of table top is 7.5 m.
4.What is the length of the wooden strip required to frame a photograph of length and breadth 32 cm and 21 cm respectively?
Answer:
Length of wooden strip = Perimeter of photograph
Perimeter of photograph = 2(length + breadth)
= 2(32 + 21)
= 2 * 53 cm
= 106 cm
Thus, the length of the wooden strip required is equal to 106 cm.
5.
A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to be fenced with 4 rows of wires. What is the length of the wire needed?
Answer:
Since the 4 rows of wires are needed.
Therefore the total length of wires is equal to 4 times the perimeter of rectangle.
Perimeter of field = 2(length + breadth)
= 2(0.7 + 0.5)
= 2 * 1.2
= 2.4 km
= 2.4 * 1000 m
= 2400 m
Thus, the length of wire = 4 * 2400 = 9600 m = 9.6 km
HOPE IT HELPS YOU!
Perimeter of rectangle = 2(l+b)
2. Length of tape=2(40+10)=2*50=100 cm
3. Length=2 m 25 cm=225 cm
Breadth=1 m 50 cm=150 cm
Perimeter=2(225+150)=2*375=750 cm= 7 m 50 cm
4. Length of wood strip=2(32+21)=2*53=106 cm=1 m 6 cm
5. Perimeter of piece of land = 2(0.7+0.5)=2*1.2=2.4 km
There are 4 rows of wires
Length of wire required=4*2.4=96 km
Hope this helped.
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