- A375
- B3.75
- C7.5
- D750
Step-by-Step Solution
Convert to one unit first: 250 cm = 2.5 . Mixing metres with centimetres gives , which is neither nor ; dropping the gives 7.5.
Answer: B) 3.75
A triangular sail has base 3 m and perpendicular height 250 cm. Find its area in square metres.
Class 7Perimeter and AreaPerimeter and Area
Key idea: Triangle area
**Area of a triangle = ½ × base × height.**
The base is any side you choose; the height is the perpendicular distance from that base to the opposite vertex (NOT the slant length of another side). For a right triangle, the two legs that meet at the right angle ARE the base and height.
Example: triangle with base 6 cm and height 4 cm. Area = ½ × .
The perimeter of a triangle is just the sum of its three sides — no formula needed.
The base is any side you choose; the height is the perpendicular distance from that base to the opposite vertex (NOT the slant length of another side). For a right triangle, the two legs that meet at the right angle ARE the base and height.
Example: triangle with base 6 cm and height 4 cm. Area = ½ × .
The perimeter of a triangle is just the sum of its three sides — no formula needed.
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 circular pond of radius 28 m has a paved walkway 7 m wide running all around the…A square courtyard has side 15 m. It is plastered over its whole surface at ₹18 per…A parallelogram-shaped kitchen garden has adjacent sides 24 m and 16 m, and the height…A circular cricket ground has a diameter of 154 m. A fielder at the exact centre throws…The side of a square is increased to three times its original length. What happens to…