Because the rock is irregularly shaped, you used the method to measure its volume. a. addition b. direct c. displacement

Because the rock is irregular in shape, you use the Displacement method to measure its volume.

After getting a cylindur (with measurements), you can it up half way with water.

For example: let say the cylindur is goes up to 10 cm. You will fill it up to 5 cm with water. Then when you put the rock inside, (for example), the water level goes up to 8 cm. You will then know that the rock that you put in displaces 3 cm of water

hope this helps