In a circle with center O, two chords, AB and CD, cross each other at right angles. If the distance from the center O to chord AB is 3 cm, while the distance from O to chord CD is 4 cm. What is the radius of the circle?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 5 cm
For two perpendicular chords, r2 = d₁2 + d₂2
r2 = 32 + 42
r2 = 9 + 16
r2 = 25
r = √25
r = 5 cm