---
title: A rectangle's area from its perimeter — a lesson of Mova's school · trees and pragmatics
description: «A rectangle's area from its perimeter», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: The perimeter of a rectangle is twice the length plus twice the width, so half the perimeter is length + width.
---

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# A rectangle's area from its perimeter

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Lesson 146 of the lessons course of Mova's primary school: 3 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0).

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- [0](https://md.mova.elamur.ai/free/en/corpora/school/lessons/146-area-from-perimeter/0/) — The perimeter of a rectangle is twice the length plus twice the width, so half the perimeter is length + width.
- [1](https://md.mova.elamur.ai/free/en/corpora/school/lessons/146-area-from-perimeter/1/) — If the perimeter is 26 cm and the length is 8 cm, then length + width = 26 ÷ 2 = 13, the width is 13 - 8 = 5 cm, and the area is 8 × 5 = 40 square centimetres.
- [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/146-area-from-perimeter/2/) — If instead the length is 3 cm more than the width: 13 - 3 = 10, 10 ÷ 2 = 5 is the width, 5 + 3 = 8 the length.

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