use the displacement of water method
eat a burger
Displacement method use it if you know it (mass/volume ) or the eureka method
Use volume displacement method.
Use a graduated cylinder and the water displacement method. Pour the sample of water in the graduated cylinder and find its meniscus. That is its volume.
Multiple the length by the width by the height
Divide the diameter by 2.
Break it up into sections and find the volumes of them, then add them together
Wouldn't a circle-based pyramid look a lot like a cone ? If so, you could probably use the formula for the volume of a cone and get away with it.
You determine the mass of an object using a balance. For liquid volume, you would use a graduated cylinder. To find the volume of a regular solid, use the appropriate geometric formula. If the solid is irregular, use the water displacement method for finding volume.
First 'weigh" the ojbect on a scale. this gives the mass. 2nd use the water displacement method to find the volume. Then divide Density = mass / volume.