calculate the cuboid 4:
A rectangular box has a surface area of 228.6 cm², a length of 4.5 cm and an height of 7.2 cm.
a) calculate the widt
b) calculate the volume
a) answer width
A = 2 * l * w + 2 * l * h + 2 * w * h
228.6 = 2*4.5*w + 2*w*7.2 + 2*4.5*7.2
228.6 = 9*w + 14.4*w + 64.8 / – 64.8
163.8 = w * (9 + 14.4)
163.8 = w * 23.4 / : 23.4
w = 7 cm
A: The width is 7 cm.
b) answer volume
V = l * w * h
V = 4.5 * 7 * 7.2
V = 226.8 cm³
A: The volume is 226.8 cm³.