Steply Language

Area and Perimeter Calculator with steps

Area and perimeter of rectangles, squares, triangles, circles and L shapes. Type your problem: see the answer, then every step with the reason. Free, no sign-up.

Solved examples

Each one solved step by step, with the reason for every step.

Area of rectangle 8 by 5 A = 40
Area of triangle base 10 height 6 A = 30
Circumference of circle diameter 8 m C ≈ 25.12 m
Area of L shape 10 by 8 cut 4 by 3 A = 68
Perimeter of rectangle 8 cm by 5 cm P = 26 cm
Area of square side 6 A = 36
Perimeter of square side 7 m P = 28 m
Area of rectangle 12 m by 3 m A = 36 m²
Perimeter of triangle 3, 4, 5 P = 12
Area of triangle base 8 cm height 5 cm A = 20 cm²
Area of circle diameter 10 cm A ≈ 78.5 cm²
Circumference of circle radius 3 C ≈ 18.84

Learn how to do it yourself

Perimeter and area · Geometry · 26 problems, printable worksheet