Question

What is the length of of BC? with work pls help

Answer 1

31

Explanation:

Assuming the drawing is to scale

1. The triangle is equilateral according to measure, So the measure of angles A, B and C are the same and the lengths of sides AB, BC and BA are equal
2. There is very little information to go off, so the measurements are done with a ruler etc.
3. With that in mind, this means AC=BC, ergo
   `6x-5=4x+7`
4. So,
   `6x-4x=7+5` then
   `x=6`
5. Plugging that back into BC, we have
   `4(6)+7=24+7=31`