Which best describes this triangle?

a.
all sides are the same length; one angle measures 90°.

b.
all sides are different lengths; one angle measures 90°.

c.
two sides are the same length; one angle measures 90°.

d.
two sides are the same length; one angle is obtuse.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.