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Earn +20 ptsQ: Number of tangents drawn from an external point to a circle?
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How many tangents can be drawn to a circle containing a point inside a circle?
No tangent No tangent
Theorem Length of tangent drawn from external point to a circle are equal?
e
Ab and ac are tangents to a circle with centre o and radius 5cmif ac equals 12cmfind the perimeter of quadrilateral aboc?
Since AB and AC are tangent to the circle O, it seems that they both are drawn from the same outside point A. As tangents to a circle from an outside point are congruent, AB ≅ BC. Also, a tangent is perpendicular to radius drawn to point of contact. So that OB and OC are congruent radii. Therefore, the perimeter of the quadrilateral ABOC equals to P = 2(12 cm) + 2(5 cm) = 34 cm.
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There are infinite diameters within a circle.
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