Xiao Ming wants to encircle the city with iron wire. If he wants to make the triangle area 30 square meters, how long is the iron wire? Just list the equation
Let the side length be a
s=0.5*a*a*cos30=30
Perimeter = 4A
Let the side length be a
s=0.5*a*a*cos30=30
Perimeter = 4A