Question

what is the surface area? 12 yd, 7 yd, 9 yd square yards submit

Explanation:

Step1: Recall surface area formula

The surface area \(SA\) of a rectangular prism is \(SA = 2(lw + lh + wh)\), where \(l=12\) yd, \(w=7\) yd, \(h=9\) yd.

Step2: Calculate each pair product

Calculate \(lw = 12 \times 7 = 84\), \(lh = 12 \times 9 = 108\), \(wh = 7 \times 9 = 63\)

Step3: Sum the three products

\(lw + lh + wh = 84 + 108 + 63 = 255\)

Step4: Multiply sum by 2

\(SA = 2 \times 255 = 510\)

Answer:

510 square yards