Triangle Maths
Circles, angles and area
Free · Designed for iPad. Not verified for macOS.
Drag three points anywhere and watch the circumcircle, incircle, bisectors, angles, sides and area follow.
Drag three points and watch the geometry follow.
Triangle Maths draws a triangle from three points you move with your finger, together with the circle through all three corners, the circle that fits inside it, and the three angle bisectors. Nothing is fixed: move a point and every line, circle and number is worked out again.
WHAT IT SHOWS
• The circumcircle, the one circle through P, Q and R, and its centre O.
• The incircle, the largest circle that fits inside the triangle, and its centre I where the three angle bisectors meet.
• J, K and M, the points where the incircle touches each side.
• The angle at each corner, the three side lengths, the area, and both radii.
• Coordinates for every point, measured from the origin.
HOW YOU USE IT
• Drag P, Q and R anywhere on the plane.
• Or tick "Keep P, Q, R on one circle" and slide them around a single circle, the way the first version of this app worked.
• Zoom the plane in and out with the scale control.
• Turn coordinates, angle bisectors, perpendiculars and the grid on or off.
• Choose a theme: Paper, Dark or Blueprint.
• Put the three points in a line and see what happens: there is no circle through them, and the app says so rather than showing a number.
Everything is worked out on your iPhone. There is no account, no sign-in, no internet connection and no data collection of any kind, so it works in airplane mode.
Rebuilt from the ground up for modern iPhones, replacing the 2015 version.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Rebuilt from the ground up for modern iPhones.
• P, Q and R now move anywhere on the plane. The circle through them is worked out as you drag, rather than the points being pinned to a fixed circle.
• New readouts: circumcircle radius and circumcentre, alongside the area, incircle radius and touch points.
• Three themes: Paper, Dark and Blueprint.
• The numbers sit beside the figure instead of on top of it, and the layout fits any iPhone, upright or on its side.
• Bigger touch targets, and a drag that follows your finger exactly.
The developer, hirenkumar patel, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- hirenkumar patel
- Size
- 49.6 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © @2015 Hirenkumar