45 45 90 Triangle Calculator

Fantazey App

Contains ads

About this app

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⭐ Now available as part of our updated Triangle Calculator —
includes both 30-60-90 and 45-45-90 in one app.
Search: "Right Triangle Calculator" by same developer.
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Enter ONE side — get ALL results instantly.
a = 10.7515 → b = 10.7515 · c = 15.2049 · A = 57.7974 · P = 36.7079
WHAT IT CALCULATES:
✔ Side a (cathetus)
✔ Side b (cathetus)
✔ Side c (hypotenuse)
✔ Area A
✔ Perimeter P
WHY 45 45 90 TRIANGLE IS SPECIAL:
• Both angles are equal — 45° and 45°
• It's both right-angled AND isosceles
• It's exactly half of a square cut diagonally
• Hypotenuse = side × √2
FEATURES:
✔ Enter any one side — all others calculated automatically
✔ Supports integers and decimals
✔ Adjustable decimal places — 0 to 4
✔ Works 100% offline
✔ Clean, minimalist design
PERFECT FOR:
• Students studying geometry
• Engineers and architects
• Teachers preparing examples
• Anyone working with right triangles
HOW IT WORKS:
Enter side a, b or c → all sides, area and perimeter calculated instantly using Pythagorean theorem.
EXAMPLES:
a=1 → c=1.4142 · a=5 → c=7.0711 · a=10 → c=14.1421 · a=7 → c=9.8995 · a=15 → c=21.2132
FAQ:
What is a 45 45 90 triangle?
A right isosceles triangle where both legs are equal and the hypotenuse equals leg × √2.
How to use?
Enter any known side — the app instantly calculates all remaining values.
Download free and solve 45 45 90 triangles in seconds.

What’s new

New
Calculation history — every result is saved automatically; tap any past entry to reuse it, or share it directly from the app
Animated triangle diagram that shows your entered values live, right on the triangle
Quick access to History from the side menu

Improved
Cleaner, easier-to-read format when sharing your calculations
History section now has its own clearly separated design on the main screen