Constructions (Circles)

341. Tangents from the Outside · equal lengths, perfect right angles

PA and PB are always equal in length, and both meet the circle at exactly 90°.

OABPA = 316.2PA = 316.2PB = 316.2PB = 316.2P
The two tangents from an external point P are equal in length (PA = PB), and each is perpendicular to the radius at its point of contact (90° at A and B). OP bisects the angle between them.
Hold to talk

Subscription Status