Question

follow the steps to find the surface area of the rectangular prism. what is the area of the front and back? top and bottom: 240 cm² front and back: ? 7 cm 12 cm 10 cm

Explanation:

Step1: Identify the dimensions for front - back

The front and back of a rectangular prism have dimensions of length and height. Here, length $l = 10$ cm and height $h=7$ cm.

Step2: Calculate area of one face

The area of a single rectangular face (front or back) is given by the formula $A = l\times h$. So, $A_1=10\times7 = 70$ $cm^{2}$.

Step3: Calculate area of front and back

Since there are two congruent faces (front and back), the total area of front and back is $A = 2\times A_1$. So, $A = 2\times70=140$ $cm^{2}$.

Answer:

$140$ $cm^{2}$