- A300
- B30
- C90
- D3000
Step-by-Step Solution
Floor = . A tile of side 30 cm = 0.3 m covers . Tiles = 27 ÷ 0.09 = 300. Converting only once and taking the tile as gives the trap 30; dividing by the side 0.3 m gives 90.
Answer: A) 300
A room floor measures 6 m by 4.5 m. Square tiles of side 30 cm are used to cover it completely. How many tiles are needed?
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).
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Perimeter and Area practice questions
More Class 7 Perimeter and Area practice
A triangle and a parallelogram stand on the same 22 cm base and between the same pair of…From a rectangular cardboard sheet 24 cm by 15 cm, a square of side 6 cm is cut away at…Which covers more ground: a circular lawn of radius 21 m or a square lawn of side 37 m?…A rectangular park is 60 m by 40 m. Two paths, each 3 m wide, run through the middle and…Find the area of this parallelogram. The dashed orange line is its height.