Define the chord of a circle.

Antara situasi berikut yang manakah lokus dalam dua dimensi? Which of the following situations are nvo-dimensional loci? I Pergerakan jarum jam. Movement of the clock hands. II Bola ping pong yang digoncang di dalam bekas silinder. Ping pong balls are shaken in a cylindrical container. Pergerakan hujung pengelap cermin kereta yang sedang bergerak. The movement of the tip of windshield wiper of a moving car. IV Menyusun perabot di dalam bilik berdasarkan saiz perabot dan ruang yang tersedia. Arranging furniture in a room based on the size of the furniture and available space. A I dan II I and II B I dan III I and III C II dan IV II and IV D III dan IV III and IV

3. If the distance between the point \( (a, 2) \) and \( (3,1) \) be 8 , then a \( = \) ? \( \begin{array}{llll}\text { (1) } 2 \pm 3 \sqrt{15} & \text { (2) } 2-3 \sqrt{15} & \text { (3) } 3 \pm 2 \sqrt{15} & \text { (4) None of these }\end{array} \)

The volume of a cone varies jointly as the height and the square of the radius. Suppose a cone has the measurements \( V=5425.92 \) cubic meters, \( r=12 \) meters and \( h=36 \) meters. Step 1 of 2 : Find the constant of proportionality \( k \), rounded to two decimal places if necessary, and use it to write an equation that models the relationship.

Een afstand van 63 km wordt op een kaart voorgesteld door \( 2,1 \mathrm{~cm} \). Op welke schaal is deze kaart getekend?

Ucharchakning katta tomoniga tushirilgan balandligini toping. Agar teng tomonli uchburchakning tomoni 12 cm ga teng bo'lsa, uning balandligini toping.