Rectangle
Area and perimeter, with the formula worked through and a drawing to scale.
Result
- Area
- 96 sq ft
- = 96 sq ft · 8.9187 m²
- Perimeter
- 40 ft
- = 40 ft · 12.192 m
- Diagonal
- 14.4222 ft
The working
Area: A = l × w
Perimeter: P = 2(l + w)
A = l × w = 12 × 8 = 96 P = 2(l + w) = 2(12 + 8) = 40
Values in feet; areas in sq ft.
About the rectangle
The shape of most rooms, decks and slabs. Square a rectangle on site by checking that both diagonals measure the same.
Every formula on this site is explained step by step in Learn: area and perimeter.
Other shapes
Square Parallelogram Rhombus Trapezoid (trapezium) Kite Triangle — three sides Triangle — base and height Right triangle Isosceles triangle Equilateral triangle Triangle — two sides and the angle between Circle Semicircle Quarter circle Sector (pie slice) Circular segment (arch) Ring (annulus) Ellipse (oval) Regular polygon (pentagon, hexagon, octagon…) L-shape Any polygon — by corner points