- A
- B
- C
- D
Step-by-Step Solution
π is approximately (or 3.14). This fraction is convenient when the radius is a multiple of 7.
Answer: A)
What is the standard value of π taken as a fraction in textbook problems?
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
Assertion (A): The area of a triangle is half the area of a parallelogram on the same…A square garden has side 25 m. A circular pond of radius 7 m is dug inside it. Find the…In a parallelogram, what is the perpendicular distance between the two parallel sides…Two triangles stand on the same base and between the same pair of parallel lines. What…A rectangular sheet is 12 cm long and 8 cm wide. Find its perimeter (in cm).