A rectangular cartboard is 1 m 60 cm long and 1m30cm wide if both measurements are correct to the nearest Metre then find the possible area of the cartboard
Answers
= 1.6 × 1.3
=2.08 m^2
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.
Question 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.
Question 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.
Question 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
Question 6:
Find the perimeter of each of the following shapes:
(a) A triangle of sides 3 cm, 4 cm and 5 cm.
(b) An equilateral triangle of side 9 cm.
(c) An isosceles triangle with equal sides 8 cm each and third side 6 cm
Answer:
(a) Perimeter of triangle = Sum of all sides
= 3 cm + 5 cm + 4 cm
= 12 cm
(b) Perimeter of equilateral triangle = 3 * side
= 3 * 9 cm
= 27 cm
(c) Perimeter of isosceles triangle = Sum of all sides
= 8 cm + 6 cm + 8 cm
= 22 cm
Question 7:
Find the perimeter of a triangle with sides measuring 10 cm, 14 cm and 15 cm.
Answer:
Perimeter of triangle = Sum of all three sides
= 10 cm + 14 cm + 15 cm = 39 cm