We have learnt how to change units like mm to cm, or cm to km

Let’s learn how to change square units as well

##
**
Hectares
**

Hectare is also a unit used to measure area.

1 hectare actually means 1 hecto metre square

1 hectare = 1 hector metre
^{
2
}

1 hectare = 1 hm
^{
2
}

Also,

1 hm = 100 m

(1 hm)
^{
2
}
= (100 m)
^{
2
}

1 hm
^{
2
}
= 100 × 100 m
^{
2
}

1 hm
^{
2
}
= 10,000 m
^{
2
}

∴ 1 hectare = 10,000 m
^{
2
}

Lets take some examples

##
**
Find area of rectangle in m
**^{
2
}

^{ 2 }

Length =
*
l
*
= 50 cm

Breadth = b = 2000 cm

Area =
*
l
*
× b

= 50 × 2000

= 1,00,000 cm
^{
2
}

= 1,00,000 × (1/100)
^{
2
}
m
^{
2
}

= 1,00,000 × 1/10,000 m
^{
2
}

= 10 m
^{
2
}

##
Find area of rectangle in cm
^{
2
}

Length =
*
l
*
= 2 m

= 2 × 100 cm

= 200 cm

Breadth = b = 10 cm

Area =
*
l
*
× b

= 200 × 10

= 2000 sq. cm

= 2000 cm
^{
2
}

##
**
Find area in m
**^{
2
}

^{ 2 }

**
^{
}**

**
**

Length =
*
l
*
= 500 cm

= 500 × 1/100 cm (As 1 cm = 1/100 m)

= 5 m

Breadth = b = 3 m

Area =
*
l
*
× b

= 5 × 3

= 15 sq. m

= 15 m
^{
2
}

##
**
Find area of rectangle in m
**^{
2
}

^{ 2 }

^{
}

Length =
*
l
*
= 2 km

= 2 × 1000 m (1 km = 1000 m)

= 2000 m

Breadth = b = 30 m

Area =
*
l
*
× b

= 2,000 × 30

= 60,000 sq. m

= 60,000 m
^{
2
}

##
Find area of rectangle in km
^{
2
}

^{
}

Length =
*
l
*
= 2000 m

= 2000 × 1/1000 km (1m = 1/1000 km )

= 2 km

Breadth = b = 4 km

Area =
*
l
*
× b

= 2 × 4

= 8 sq. km

= 8 km
^{
2
}

##
**
Find area of rectangle in hectare
**

**
**

Length =
*
l
*
= 6 km

= 6 × 1000 m (1km = 1000 m)

= 6000 m

Breadth = b = 10 m

Area =
*
l
*
× b

= 6000 × 10

= 60,000 m
^{
2
}

= 60,000 × 1/10,000 hectare (1m
^{
2
}
= 1/10,000 hectare)

= 6 hectare

##
**
Find area of rectangle in hectare
**

**
**

Length =
*
l
*
= 3 km

Breadth = b = 4 km

Area =
*
l
*
× b

= 3 × 4

= 12 km
^{
2
}

= 12 × 10,00,000 m
^{
2
}
(1km
^{
2
}
= 10,00,000 m)

= 1,20,00,000 m
^{
2
}

= 1,20,00,000 × 1/10,000 hectare (1m
^{
2
}
= 1/10,000 hectare)

= 1,200 hectare

##
**
Change units
**

###
50 cm
^{
2
}
in mm
^{
2
}

= 50 cm
^{
2
}

= 50 × 1 cm
^{
2
}

= 50 × (10 mm)
^{
2
}
(1 cm = 10 mm)

= 50 × 100 mm
^{
2
}

= 5,000 mm
^{
2
}

###
2 ha in m
^{
2
}

= 2 hectare

= 2 × 10,000 m
^{
2
}
(1ha = 10,000 m
^{
2
}
)

= 20,000 m
^{
2
}

###
**
10 m
**^{
2
}
in cm
^{
2
}

^{ 2 }in cm

^{ 2 }

= 10 m
^{
2
}

= 10 × 1 m
^{
2
}

= 10 × (100 cm)
^{
2
}

= 10 × 10,000 cm
^{
2
}
(1 m = 100 cm)

= 1,00,000 cm
^{
2
}

###
**
10 cm
**^{
2
}
in m
^{
2
}

^{ 2 }in m

^{ 2 }

= 10 cm
^{
2
}

= 10 × 1 cm
^{
2
}

= 10 × (1/100 m)
^{
2
}

= 10 × 1/10000 m
^{
2
}
(1 cm = 1/100 m)

= 1/1000 m
^{
2
}

= 0.001 m
^{
2
}