MATHS QUERY
Area and Perimeter Formulas of 2-D Shapes
TOC
Area formulas of 2-D shapes
| Polygon | Area |
|---|---|
| Rectangle | \(l \times b\) |
| Square | \(a \times a = a^2\) |
| Parallelogram | \(b \times h\) |
| Rhombus |
\(b \times h\)
or \(\frac{1}{2} \times d_1 \times d_2\) |
| Trapezium | \(\frac{1}{2}(a + b) \times h\) |
| Triangle | \(\frac{1}{2} \times b \times h\) |
| Isosceles triangle | \(\frac{b \sqrt{a^2 – b^2}}{4}\) |
| Equilateral triangle | \(\frac{\sqrt{3}}{4} a^2\) |
| Circle | \(\pi r^2\) |
Perimeter formulas of 2-D shapes
| Polygon | Perimeter |
|---|---|
| Rectangle | \(2(l + b)\) |
| Square | \(4 a\) |
| Parallelogram | \(2(a + b)\) |
| Rhombus |
\(4a\)
or \(2\sqrt{d_1^2+d_2^2}\) |
| Trapezium | \(a + b + c + d\) |
| Triangle | \(a + b + c\) |
| Isosceles triangle | \(2a + b\) |
| Equilateral triangle | \(3a\) |
| Circle | \(Circumference = 2\pi r\) |