# iCrosss

Cool math tool is great for visualizing 3-D shapes.

## What parents need to know

Educational value

Kids can learn the names and characteristics of nearly 50 3-D solids with this well-designed reference tool. Kids can explore a 3-D image of each polyhedron and place points to create a cross section. For each solid, an info sheet lists features including number of sides and vertices as well as formulas for calculations such as surface area. Shape names like octahedron or a pentagonal hexecontahedron offer kids a great opportunity to brush up on their Greek prefixes and root words. iCrosss is a useful tool to help kids visualize complex geometric forms but offers little opportunity for them to apply the concepts.

Ease of play

iCrosss has an intuitive interface that makes exploring the nearly 50 three-dimensional polyhedrons a fun, interactive experience. Tap the question mark in the top right corner for a walk-through text tutorial on all the app's features.

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## Parents Need to Know

Parents need to know that iCrosss is an interactive encyclopedia of polyhedrons -- three-dimensional solids kids often study in geometry class, which include cubes, pyramids, and prisms. Kids can explore 3-D representations of nearly 50 different polyhedrons and can experiment with creating cross-sections. Kids can also access info on each polyhedron including the number of vertices, edges, and faces as well as formulas for surface area, volume, face diagonal, and more.

## Kids say

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Kids choose a polyhedron to explore from a list divided into six categories. A question mark icon in the top right walks users through the app's features. Kids rotate the 3-D image with a finger, tap to set points for a cross-section, and use pinch motions to separate the polyhedron at the cross-section. Different viewing modes help kids explore the solid, and an info section provides a description and important data including the number of vertices, edges, and faces and a set of formulas including surface area, volume, face diagonal, and more.

## Is it any good?

QUALITY

ICROSSS is a very cool tool for exploring and studying polyhedrons. The 3-D representations are accurate, and the interactive animations are fun to manipulate. Kids can choose from a list of solids comprehensive enough to serve as a reference tool for students in middle school through college.

As slick as it is, iCrosss is nothing more than an interactive reference tool. Kids aren't encouraged to do calculations or play with the math in any deep way. It would be a great addition to the app if there were opportunities or suggestions to extend the learning –- printable templates for constructing paper models of the polyhedrons is one idea.

• Search online for "printable polyhedron patterns" and print out templates for you and your kids to construct together.

• Ask your kids to identify different polyhedrons around your home. For example, do you know which polyhedron a classic black and white soccer ball resembles?

## App details

 Devices: iPhone, iPod Touch, iPad Subjects: Language & Reading: vocabularyMath: geometry, shapes Skills: Thinking & Reasoning: investigation, part-whole relationships Price: \$.99 Pricing structure: Paid Release date: July 12, 2012 Category: Education Size: 3.20 MB Publisher: Oleh Yudin Version: 1.2 Minimum software requirements: iOS 3.2 or later

## This review of iCrosss was written by

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## Quality

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## What parents and kids say

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Parent of a 8 and 10 year old Written bykhancock0 January 5, 2013

#### Not worth it.

Not much to it. You can spin around the figures and highlight planes. It has the mathematical equations for each figure. That's about it. Oh, and it crashes often.