# Perimetarea — Area & Perimeter of Shapes

> Area & Perimeter of Shapes (iPhone/iPad app by Karen McDonald.)

- Source: https://appshunter.io/ios/app/perimetarea/id1150142929 (this page in markdown: same URL + `.md`)
- Developer: [Karen McDonald](https://appshunter.io/developer/687726952)
- Category: Education
- Price: $0.99
- Age rating: 4+
- Requires: iOS 13.0 · 20 MB
- Languages: American English
- Released: 2016-09-13
- Data updated: 2025-01-09
- User reviews in markdown: https://appshunter.io/ios/app/perimetarea/id1150142929/reviews.md

## What is Perimetarea?

Students learn to understand and calculate area and perimeter in 42 multiple-choice activities in 7 levels of graduated difficulty, starting with rectangles and squares and ending with patterns composed of squares, triangles, other polygons, and circles. 

Features:

•	7 levels are: Rectanglia (rectangles and squares), Trianglia I (right, acute, and obtuse triangles, compared to rectangles and other parallelograms), Trianglia II (rotated right, isosceles right, isosceles, equilateral, obtuse, and acute triangles), Quadrilateralia (kite, rhombus, right trapezoid -- or trapezium, isosceles trapezoid, and some odd quadrilaterals), Polygonia (regular and irregular pentagons, hexagons, and octagons), Circlia (circles), and Compositonia (patterns made from other shapes).

•	A background grid of square units visually shows the meaning of area in initial activities and reinforces understanding in subsequent selected activities.

•	Activities to develop understanding are introduced before mathematical expressions to help students remember the meaning of expressions and why they are used for calculations.

•	Parallelograms, including rectangles, are described from the beginning using vocabulary of "base" and "height" in order to make language consistent for a wider range of shapes. 

•	The relationships between different shapes and calculations for area and perimeter are shown through activities that directly compare shapes and their sizes when they share one or more measurements.

•	Early activities use integer measurements; later activities, as appropriate, include decimal measurements. 

•	As activities increase in difficulty, students must pay attention to details by identifying and choosing pertinent information (e.g., base of rotated shapes) to make appropriate and accurate calculations.

•	Requires only single touches to make a choice from multiple options.  

•	Game-like environment provides immediate feedback in a non-busy setting conducive to thoughtful exploration.

•	Self-contained; students will not see ads or have access to in-app purchases or the Internet from within this app.

Please review this app if you find it useful!


## Version history (last 3 releases)

### 1.2 — 2021-01-06

Updated for new guidelines; minor changes within app

### 1.1 — 2017-10-31

Some changes to graphics and text.

### 1.0 — 2016-09-07

No release notes.

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## More apps by Karen McDonald

- [Xyla and Yabu](https://appshunter.io/ios/app/xyla-and-yabu/id689016796)
- [Gem Detector](https://appshunter.io/ios/app/gem-detector/id908421751)
- [Crate World](https://appshunter.io/ios/app/crate-world/id1053210764)
- [Math Scribble](https://appshunter.io/ios/app/math-scribble/id1071127923)

All apps by Karen McDonald: https://appshunter.io/developer/687726952

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2025-01-09.*