Triangle ABC is similar to triangle DEF and has a ratio of similarity of 15:7. If side BC measures 8 mm, how long is side EF?
1 answer:
You might be interested in
Answer:
a₁ = 6
Step-by-step explanation:
The sum to n terms of a geometric sequence is
=
where a₁ is the first term and r the common ratio
Here = 1530 and r = 2, thus
= 1530 , that is
a₁ (256 - 1) = 1530
255a₁ = 1530 ( divide both sides by 255 )
a₁ = 6
