A square of side a has perimeter:
A6a
B4a
C2a
D3a
Answer & Solution
Correct answer: B. 4a
1. A square has four sides, all equal.
2. Each of them is a units long.
3. So the perimeter is 4a units.
4. The answer is 4a.
_Source: NCERT Class 9 Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
Related questions
An arc's length depends on the angle it subtends at the:The length of a semicircle of radius r is:Which shapes are always cyclic?Who found a formula for the area of a cyclic quadrilateral?Heron's formula finds a triangle's area from its:Using Heron's formula, the area of the 3, 4, 5 triangle is:For a triangle of sides 3, 4 and 5, the semi-perimeter is:The semi-perimeter of a triangle is: