Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 11)
What is the length of a chord that is 8 cm from the center of a circle with a radius of 10 cm?
6 cm
12 cm
16 cm
20 cm
Explication
Using the Pythagorean theorem, half the chord's length is 6 cm (10^2 - 8^2 = 6^2). Therefore, the entire chord is 12 cm.