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Question
the length of its side of a triangle are in ratio 3:4:5 and its perimeter is 1444 cm find the area of the triangle ,and the height corresponding to the longest side

Note that 3² + 4² = 5², so it is a right triangle.
perimeter = 3x + 4x + 5x = 1444
x = 361/3

base = 361 cm
height = 1444/3 cm
hypotenuse = 1805/3 cm
area = (1/2)(base)(height) = 86,880⅔ cm²

cosθ = (3x)/(5x) = h/(4x)
h = 12x/5 = 288.8 cm

Volunteer

Janet Yang

Expertise

I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.

Experience

I tutor students (fifth through twelfth grades) and am a Top Contributor on Yahoo!Answers with over 24,000 math solutions.

Publications
Co-author of An Outline of Scientific Writing: For Researchers With English as a Foreign Language

Education/Credentials
I have a Bachelor's degree in Applied Mathematics from the University of California at Berkeley.

Past/Present Clients
George White Elementary School. Homework Help program at the Ridgewood Public Library, Ridgewood, NJ. Individual students.