Answer: base = 8.1 cm
Step-by-step explanation:
The formula for calculating the area of a triangle is expressed as
Area = 1/2 x base x height
From the information given,
Area = 17.01
Height = 4.2
Thus,
17.01 = 1/2 x base x 4.2
17.01 = 2.1 x base
base = 17.01/2.1
base = 8.1 cm