Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 5)
If a circle has a radius of 5 cm, and a chord is drawn 3 cm from the center, what is the length of the chord?
4 cm
6 cm
8 cm
10 cm
설명
Using the Pythagorean theorem, half the chord is 4 cm (5^2 - 3^2 = 4^2), so the full chord is 8 cm.