Explain the relationship between equal chords and their distances from the center of a circle.

Activité 18 Dans le plan rapporté à un repère orthonormé \( (\mathrm{O}, \overrightarrow{\mathrm{i}}, \overrightarrow{\mathrm{j}}) \), on donne les points \( -\mathrm{A}(2,1), \mathrm{B}(4,3) \) et \( \mathrm{M}(\mathrm{x}, \mathrm{y}) \). a) Calculer \( \frac{\mathrm{MA}}{\mathrm{MB}}=\overrightarrow{A B}= \) b) En déduire une équation cartésienne du cercle de diamètre \( [\mathrm{AB}] \).

The diameter of a circle is 7.8 cm . Calculate the circumference of the circle. Give your answer concet to 3 significant figures.

A cube shaped box has a volume of 216 cubic centimeters. What is the length of a side of the box? \( \begin{array}{llll}\text { A. } 6 \text { centimeters } & \text { B. } 9 \text { centimeters } & \text { C. } 12 \text { centimeters } & \text { D. } 18 \text { centimeters }\end{array} \)

If a chord is 10 cm long, what can you say about its distance from the center of the circle?

Erkläre, wie man die Steigung mit zwei Punkten auf einer kartesischen Ebene berechnet.