# Chapter 9 - Section 9.2 - Pyramids, Area, and Volume - Exercises - Page 407: 24a

240

#### Work Step by Step

We find the height of each triangle: $h = \sqrt{13^2 - 5^2 }=\sqrt{144}=12$ Thus, we find the lateral area: $A = (1/2)(12)(4)(10)=240$

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