△ABC is a right angle ∠ACB=90° , AC=16, BC=12, CD is perpendicular to AB and AD = 12.8. How long is CD?
Find out the exact value of cos8π3
Shima has 45th of a tank of fuel in his car. He uses 110th fraction of a tank per day. How many days will his fuel last?
The length of rectangle ABCD is 65th of it's breath. Its perimeter is 132. What is it's area?