Secant-Secant Theorem Calculator

Online secant-secant theorem calculator. Enter three segments of two secants from an outside point to find the fourth, using the equal-products rule—great for circle power.

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Near×Far = Near×Far for the two secants

Secant 1 · near

First secant near

Secant 1 · far

First secant far

Secant 2 · near

Second secant near

📖 Tutorial | Secant-Secant

1. Definition

For two secants from an outside point, the near×far products are equal.

2. Formula & Notation

Near, far	Met in that order
PA·PB	Near×far

3. Properties & Laws

Equal products;
Far exceeds near;
Outside-point power;
Unified with tangent.

4. Steps

Enter three segments;
Click "Find Far";
Or click "Load Example".

5. Worked Examples

Example: 4, 10, 5.
Solution: far = 8.

6. Common Pitfalls

Near×far;
Far>near;
Same point P.

❓ FAQ | Secant

Content?

Equal near×far products.

4,10,5 far?

Near and far?

Near first.

Tangent relation?

Power of a point.

Find a segment?

Divide.

Far point?

Greater than near.