Like a private tutor — available 24/7, aligned to your state's curriculum, and costs less per month than a single tutoring session.
No credit card · No sign-up required to try
Problem
A rectangle has a length of 12 cm and a width of 8 cm. What is the area and perimeter?
Solution
Area formula
Area = length × width
The area of a rectangle is length multiplied by width.
Substitute values
Area = 12 × 8 = 96 cm²
Plug in length = 12 and width = 8.
Perimeter formula
P = 2 × (length + width)
Perimeter adds all four sides — two lengths and two widths.
Calculate perimeter
P = 2 × (12 + 8) = 2 × 20 = 40 cm
Add length and width first, then multiply by 2.
Area = 96 cm² · Perimeter = 40 cm
Remember: Area fills the space inside (cm²), perimeter goes around the outside (cm).
Solve your own problem — free, instant, no login
Try it →Select your grade (1–12) and state. We align every answer to your curriculum — TEKS, BEST, Common Core, and more.
Type any math problem in plain English. Algebra, geometry, fractions, SAT prep — we handle it all.
See every step explained clearly. Stuck? Use progressive hints to guide yourself to the answer.
Built for real homework, real tests, and real learning.
Type any problem and get a clear, step-by-step breakdown in seconds.
Every answer matches your state's standards — from Texas TEKS to Florida BEST.
Nudge, not spoil. Three progressive hints help students think, not just copy.
Track topics covered, streak, and accuracy — gated by a parent PIN.
Explain a whole topic, not just one problem. Perfect for test prep. (Coming soon)
Daily streaks keep students motivated to practice consistently.
Addition in Grade 1 to calculus in Grade 12 — one subscription covers it all.
Common problems are cached so answers are instant and costs stay low.
Private tutors charge $50–150/hr. We charge $9/month.
Free forever for 5 problems a day. No credit card. No commitment. Upgrade anytime for unlimited access.
Get started free →