Question

6: Abby is making a decoration. When folded, the decoration is a triangular pyramid made of four congruent equilateral triangles. Approximately, what is the surface area of Abby's decoration? ​ ​

Answer 1

85 square inches

Explanation:

I think your question missed key information, allow me to add in and hope it will fit the orginal one. Please have a look at the attached photo

My answer:

From the question, four congruent equilateral triangles with the following information:

• The height: 6.06 inches

• The base : 7 inches

=> The area of the quilateral triangle is:

=1/2*the base*the height

= 1/2*60.6*7

= 21.21 square inches

=> the surface area of Abby's decoration is:

= 4 * The area of the quilateral triangle

= 4*21.21

= 84.84 square inches

≈ 85 square inches

Hope it will find you well.