Two parallel chords of length 30cm and 16cm are drawn on the opposite side of the center of a circle of radius 17cm. find the distance between the chords
Answers
Step-by-step explanation:
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Let AB and CD be two chords of a circle such that AB is parallel to CD and they are on the opposite sides of the center.
AB = 30cm and CD = 16cm [ Given ]
Draw OL ⊥ AB and OM ⊥ CD.
Join OA and OC.
OA = OC = 17cm [ Radius of a circle ]
The perpendicular from the center of a circle to a chord bisects the chord.
p∴ AL = AB/2 = 30/2 = 15 cm
Now, in right angled ∆ OLA,
∴(OA)² = (AL)² + (LO)²
[ By Pythagoras theorem ]
⇒(LO)² = (OA)² – (AL)²
⇒ (LO)² = (17)² – (15)²
⇒ (LO)² = 289 - 225
⇒ (LO)² = 64
⇒ LO = 8
Similarly,
In right angled ACMO,
= (OC) = (CM)+(MO)
= (MO)² = (OC) – (CM)²
⇒ (MO)² = (17)² – (8)²
⇒ (MO)² = 289 - 64
⇒ (MO)² = 225
∴ MO 15 cm
Hence, distance between the chords = (LO + MO) = (8 + 15) cm = 23 cm
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