Challenge for just fully qualified answerers not for others!
• A table top measures 2 m 25 cm by 1 m 50 cm. What is perimeter of the table. Give anser in both units one by one.
• A rectangular piece of land measure 0.7 km by 0.5 km Each side is to be fenced with r rows of wires. What is length of wire needed?
• The lid of rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of he tape required?
• Show that perimeter of rectangle is 2(l+b) units.
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Answers
Answer:
• Length of table = 2m 25cm
Breadth of table = 1m 50cm
Perimeter of table = 2 ( l + b )
= 2 ( 225 + 150 )
= 2 × 375
= 750 cm
= 7m 50cm
• Length of rectangular land = 700m
Breadth of rectangular land = 500m
Perimeter of rectangular land = 2( l + b )
= 2( 700 + 500)
= 2 × 1200
= 2400m
.°. Length of the wire = 2.4 km or 2400m.
• Length of the rectangular box = 40 cm
Breadth of the rectangular box = 10 cm
Perimeter of rectangular box = 2 ( l + b )
= 2 ( 40 + 10 )
= 2 × 50
= 100 cm.
.°. Length of tape = 100 cm.
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★ Question ★
A table top measures 2 m 25 cm by 1 m 50 cm. What is perimeter of the table. Give anser in both units one by one.
★ Solution ★
Perimeter of the table-top
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★ Question ★
A rectangular piece of land measure 0.7 km by 0.5 km Each side is to be fenced with r rows of wires. What is length of wire needed?
★ Solution ★
Total perimeter =2(l+b)
Since 4 rows is fenced at each side,
Total length of the wire needed
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★ Question ★
The lid of rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of he tape required?
★ Solution ★
The length of the tape would be equivalent to the perimeter.
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★ Question ★
Show that perimeter of rectangle is 2(l+b) units.
★ Solution ★
Considered a rectangle ABCD in which AB and DC = L and AD and BC = B
To prove : P of rectangle = 2( L + B )
Proof : In rectangle ABCD we know that the sum of all sides is equal to its perimeter
Perimeter of given figure = L + B + L + B
perimeter of rectangle = 2L + 2B
perimeter of rectangle = 2 ( L + B )
( Hence prove )
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★ Hope you understand this concept mate ★