If there are 7 girls and three boys in the class, what percent of the class is boys ?
1 answer:
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Answer:
The area of the two-dimensional cross section is
Step-by-step explanation:
we know that
The two-dimensional cross section that is parallel to face ABC is a triangle congruent with the triangle ABC
Therefore
Calculate the area of triangle ABC
we have that
Triangles ABC and DEF are congruent
so
substitute