- A180
- B110
- C220
- D145
Step-by-Step Solution
Curved arc = π m. The straight edge is the diameter = m. Total = 110 + 70 = 180 m. Leaving out the straight edge gives 110 m; adding only the radius gives 145 m; 220 m is the whole circle.
Answer: A) 180
A semicircular flower bed has radius 35 m. Brick edging is laid along its COMPLETE boundary — the curved arc as well as the straight edge. What total length of edging is needed? Use π = (answer in m).
Class 7Perimeter and AreaPerimeter and Area
Key idea: Circumference of a circle
**Circumference = π × × π × .**
Use π = when the radius is a multiple of 7 (cleaner arithmetic). Use π ≈ 3.14 otherwise (or leave the answer in terms of π).
Example cm, π = cm.
Example cm, π ≈ 3.14): ≈ cm.
Use π = when the radius is a multiple of 7 (cleaner arithmetic). Use π ≈ 3.14 otherwise (or leave the answer in terms of π).
Example cm, π = cm.
Example cm, π ≈ 3.14): ≈ cm.
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
The perimeter of a rhombus-shaped window pane is 68 cm. How long is each of its sides…A rectangular verandah is 7 m long and 4 m wide. Vitrified tiles are laid over the whole…A window is a rectangle 2 m wide and 1.5 m tall with a semicircle on top whose diameter…A rectangular sugarcane field is 250 m long and 160 m wide. Find its area in hectares.…A triangular banner has base 24 cm and height 15 cm. A parallelogram banner has base 18…