Posted by it's me on .
Triangle ABC is an equilateral triangle.AD=10 What is the length of CD? Give your answer to the nearest whole number.

Math, not "10th grade" 
Writeacher,
Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.

math  needs help 
SraJMcGin,
The School Subject is NOT 10th grade. Is it math? If so, state that for a math teacher to help you.
Sra 
10th grade geometry 
PsyDAG,
Do not know where D is. Needs more explanation.