Question

What is the distance between two parallel tangents of a circle having radius
4.5 cm ? Justify your answer.
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Answer 1

Answer:

⇒ O is the center of the circle.

⇒ l and m are two parallel tangents of the circle.

⇒ Radius of the circle =4.5cm

⇒ AB is distance between two parallel tangents.

⇒

Answer 2

Answer:

Step-by-step explanation:

Let the lines PQ and RS be the two parallel tangents to circle at M and N respectively. Through centre O, draw line AB || line RS.

• OM = ON = 4.5 [Given]
• line AB || line RS [Construction]
• line PQ || line RS [Given]
• ∴ line AB || line PQ || line RS

Now, ∠OMP = ∠ONR = 90° (i) [Tangent theorem]

• For line PQ || line AB,
• ∠OMP = ∠AON = 90° (ii) [Corresponding angles and from (i)]
• For line RS || line AB, ∠ONR = ∠AOM = 90° (iii) [Corresponding angles and from (i)]
• ∠AON + ∠AOM = 90° + 90° [From (ii) and (iii)]
• ∠AON + ∠AOM = 180°
• ∠AON and ∠AOM form a linear pair.
• ray OM and ray ON are opposite rays.
• Points M, O, N are collinear. (iv)
• MN = OM + ON [M – O – N, From (iv)]
• MN = 4.5 + 4.5
• MN = 9 cm

Distance between two parallel tangents PQ and RS is 9 cm.

So, ur Answer is 9cm.