A quadrilateral is drawn to circumscribe a circle. Which of the following equations must hold?
Answer and explanation
Correct answer: B.
- Step 1: Tangents drawn from an external point to a circle are equal in length.
- Step 2: Let points of contact be . Then .
- Step 3: .
Answer
.
Why not the others: equates adjacent sums; difference form does not hold; and diagonals are not circumscribed sides.
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