The area of a triangle is 3.99cm2 . If the base is 4.2 cm, how do you find the height ?

Answer 1

area = (1/2) base x height
3.99 = (1/2)(4.2)(height)
height = 2(3.99)/4.2
= ...

Answer 2

Is it 7.98 x2 x4.2 /1/2 =16.75?

Answer 3

I get
height = 1.9 cm

check:
area = (1/2)(4.2)(1.9) = 3.99