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:

Side A = 3Side B = 4Diagonal = 5.000

💡 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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