PLZZZ HELPP REALLLY QUICKKK I WILL GIVE SOMEONE BRAINLEST PLZZ HELLPPP AND EXPLAINNNN PLZZZ EXPLAINNN

Hi there!
The ratio of the base to the height is 4:1, so:
12 cm : x cm
12/4 = 3, which is the scale. Thus, x = 3 cm.
Find the area using the equation A = b × h
A = 3 × 12 = 36 cm²