Bacteria live in groups called colonies. colonies are usually circular. the diameter of a particular bacterial colony is 12 mm. the circumference of a circle is equal to pi (3.14) times the diameter (c = pi times the diameter)
1.what is the circumference of the colony?
2.what is the radius of the colony

the circumference is

3.14 times the diameter or

3.14 x d

since d is 8 the equation becomes

3.14 x 8 = 25.12 mm in circumference.

Explanation:

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave