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1)Perimeter is the distance around a closed figure.
2)The perimeter of a rectangle is 2(l+b).
3) The part of a plane occupied by a closed figure is called its area.
4)The perimeter of a rectangle = 2(l+b)
5)The distance around a circular region is called its circumference.
6)1 hectare = 10,000m²
7)1000cm² = 1 m²
8)Circumference of a circle is 2πr
9)If the side of a square is halved,then the perimeter becomes 1/2 times the original perimeter.
Let a = side of square
When halved,Side = a/2
We know:
Perimeter = 4a
Putting values,
Perimeter = 4(a/2)
= 2a
10)Perimeter of an equilateral triangle = 3a
Given , side = 6cm
Putting the values,
Perimeter = 3a
=> 3(6)
=> 18cm
Hence, the perimeter is 18cm.
11)Given,
- Area of square = 36cm²
We know:
→Area = side²
⇒36=a²
⇒ a = 6cm.
Using the formula,
Perimeter of square = 4a
⇒ 4(6) = 24cm.
12)1km²=1000000m²
13)Given:
- Area = 154cm²
Using the formula,
Area = πr²
⇒A = (22/7)r²
⇒ r = 7cm
14)Given:
- Area = 120cm²
- Length = 15cm
Using the formula,
Area = l×b
⇒ 120 = 15×b
⇒ b = 8cm
15)Given:
- Base = 10cm
- Height = 6cm
Using the formula,
Area of a parallelogram=bh
⇒ Area = (10)(6)
=60cm².
16)Given:
- Diameter = 28cm
We know,
Radius = Diameter/2
=> 28/2 = 14cm
Using the formula,
Circumference = 2πr
=> 2×22×14/7
=>2×22×2 = 88cm
17)Given:
- Length = 250m
- Breadth = 10m
Using the formula,
Area = lb
= 2500m²
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