Respuesta :

Answer:

10 mm

Step-by-step explanation:

We know that the formula for a triangle is A= 1/2(b)(h)

Plug in 30mm for the area as shown and 6 for the base= 30=1/2(6)(h)

Solve= 30=3h

Divide each side by 3 to get h by itself. h=10 or b= 10

depends on which one is missing ^^