Right Angle (3-4-5) Calculator
Calculate right angles using 3-4-5 method
Right Angle Calculator
Using the 3-4-5 Method:
The classic 3-4-5 triangle rule: if sides are in a 3:4:5 ratio, the corner forms a perfect 90° angle. This calculator shows you the scaled 3-4-5 measurements for your dimensions.
Right Angle Measurements
Diagonal (Hypotenuse)
5.000
Is Square?
Yes ✓
3-4-5 Method (Scaled):
Side 1
3.00
Side 2
4.00
Diagonal
5.00
Measure these distances to verify a perfect right angle
Triangle Angles:
Angle A
53.1°
Angle B
36.9°
Angle C
90°
Calculation Breakdown:
• Side A: 3 units
• Side B: 4 units
• Diagonal: √(3² + 4²) = √25.00 = 5.000
• Formula: c² = a² + b² (Pythagorean theorem)
• To verify square: Measure diagonal. If it equals 5.000, the corner is square (90°)
Visual Representation:
💡 Pro Tip:
The 3-4-5 method is perfect for laying out building foundations and ensuring corners are square. For large layouts, use multiples like 6-8-10 or 9-12-15 for greater accuracy. Always measure the diagonal to verify - if it matches the calculated value, your corner is perfectly square at 90 degrees!
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