Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 26)
If a chord of length 8 cm is 3 cm away from the center of a circle, what is the radius of the circle?
4 cm
5 cm
6 cm
7 cm
Giải thích
Using the Pythagorean theorem, r^2 = 3^2 + 4^2, thus r=5 cm