Home › CBSE Class 9 › mathematics › perimeterandarea › The circumference of a circle of radius 7 cm (us…
The circumference of a circle of radius 7 cm (use π ≈ 22/7):
A22 cm
B33 cm
C44 cm
D154 cm
Answer & Solution
Correct answer: C. 44 cm
Circumference = 2πr = 2 × (22/7) × 7 = 44 cm. (Note: 154 cm² is the AREA of this circle, not perimeter — a classic distractor.)
Related questions
Two circles have radii in the ratio 2:3. The ratio of their CIRCUMFERENCES is:A square garden of side 20 m is surrounded by a path of uniform width 1 m on the outside. The area of a triangle with base b and height h is:Around 263 CE, the Chinese mathematician Liu Hui's 'circle-cutting method' approximated π The figure shows a circle with radius r and diameter d marked.
![Circle with radius and dThe area of a rectangle of length 12 cm and width 5 cm is:The figure shows a labelled rectangle with length L and width W.
![Rectangle diagram (WikWhat is the perimeter of an equilateral triangle of side 7 cm?