AngleRight

AngleRight solves triangles and parallelograms and draws them to scale as you type. Enter what you know and every side, angle, height and area appears instantly, with clear step-by-step working.

RIGHT TRIANGLES
• Right angle at B: solve from two legs, a leg and the hypotenuse, a leg and an angle, the hypotenuse and an angle, or the area and a leg
• Pythagoras, sine, cosine and tangent shown step by step

ANY TRIANGLE
• SSS, SAS, ASA, AAS and SSA
• The ambiguous SSA case shows both possible triangles, or explains why none exists
• Area, perimeter, heights, medians, inradius and circumradius
• Tells you whether a triangle is acute, right or obtuse, and scalene, isosceles or equilateral

PARALLELOGRAMS
• Solve from two sides and an angle, two sides and the height, two sides and a diagonal, the base with height and angle, or both diagonals
• Height, diagonals, area and perimeter, and whether it is a square, rectangle or rhombus

PROTRACTOR AND TILT LEVEL
• Drag two arms to measure any angle, with supplement and reflex angles
• Tilt level: lay your iPhone on a surface or hold its edge against a slope

DRAW
• Drag the corners of a triangle or four-sided shape on a grid and watch the measurements update live
• Snap to grid, and one tap to make a right angle, a parallelogram or a rectangle

DESIGNED FOR iPHONE AND iPAD
• Four themes — Pearl, Midnight, Royal Gold and Sand — plus Auto for Light and Dark Mode
• Landscape layout with the drawing beside the controls
• Degrees or radians, 0 to 4 decimal places
• Optional inscribed and circumscribed circles and heights on the drawings
• Share your results as text
• A formula guide covering Pythagoras, SOH CAH TOA, the sine and cosine rules, area and more

PRIVATE BY DESIGN
No account, no ads, no tracking and no internet connection needed. Everything stays on your device.