Length of chord = 2rsin(θ2)2r \sin \left( \frac{\theta}{2} \right)2rsin(2θ)
= 2×8×sin(902)2 \times 8 \times \sin \left( \frac{90}{2} \right)2×8×sin(290)
= 16×2216 \times \frac{\sqrt{2}}{2}16×22
= 82 cm8\sqrt{2} \text{ cm}82 cm
