# Chapter 8 - Section 8.4 - Circumference and Area of a Circle - Exercises - Page 374: 46

50%

#### Work Step by Step

When it is raised, the area approximately changes from being two equilateral triangles to being three equilateral triangles. Since all equilateral triangles have the same area, we find: % change = $\frac{3-2}{2}(100) = 50$%

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