Respuesta :
Answer: Base= 21 ft
Step-by-step explanation: 0.5(base)(height) = 0.5 (base) 4 = 42
Hope this helps!
Answer: 21 feet.
Formula of area for a triangle is 1/2bh
2x42=84 84/4=21
Formula of area for a triangle is 1/2bh
2x42=84 84/4=21