45 45 90 Triangle Calculator

Calculate sides, area & perimeter of 45 45 90 triangle. Fast & offline.

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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.