Have a few questions... Which is the scale factor proportion for the reduction shown?

A larger and smaller triangle with corresponding heights and bases.
StartFraction original height over original base EndFraction = StartFraction reduction height over reduction base EndFraction
StartFraction original height over original base EndFraction = StartFraction reduction height over original base EndFraction
StartFraction original height over original base EndFraction = StartFraction reduction base over reduction height EndFraction
StartFraction original height over reduction base EndFraction = StartFraction original base over reduction height EndFraction
The scale factor of a figure and its enlargement is 4. What is the new length of the enlarged figure if the original length is 4.5 cm?
4.0 cm
8.5 cm
16 cm
18 cm
Consider the original triangle and the enlargement.

A triangle has a base of 3 centimeters and height of 2 centimeters. A larger triangle has a base of A and height of 8 centimeters.
Figures not drawn to scale.

What is the length of side A in centimeters?
3
4
12
24

Please answer as soon as possible, thanks! (Will give brainliest too :D)