- A40 hectares
- B0.4 hectares
- C400 hectares
- D4 hectares
Step-by-Step Solution
Area = . Since 1 hectare = , the field is 40000 ÷ 10000 = 4 hectares. Dividing by 1000 instead of 10000 gives the trap 40 hectares.
Answer: D) 4 hectares
A rectangular sugarcane field is 250 m long and 160 m wide. Find its area in hectares. (1 hectare = )
Class 7Perimeter and AreaPerimeter and Area
Key idea: Parallelogram area
**Area of a parallelogram = base × height.**
Same idea as a rectangle, but the height is the perpendicular distance between the two parallel sides — NOT the slant length of the side. Pick any side as the base, drop a perpendicular to the opposite parallel side, measure that — that's the height.
Example: parallelogram with base 8 cm and perpendicular height 5 cm. Area = . The slant side could be longer; doesn't matter for area.
Perimeter of a parallelogram = 2 × (one side + adjacent side).
Same idea as a rectangle, but the height is the perpendicular distance between the two parallel sides — NOT the slant length of the side. Pick any side as the base, drop a perpendicular to the opposite parallel side, measure that — that's the height.
Example: parallelogram with base 8 cm and perpendicular height 5 cm. Area = . The slant side could be longer; doesn't matter for area.
Perimeter of a parallelogram = 2 × (one side + adjacent side).
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