If this number is bigger than matlab price bought from 2 × π × r × Tr, then matlab possible circle is regarded as engineering real circle. Where Tr = 0. 7 for WBCs and Tr = 0. 5 for RBCs. 2 × π × r is matlab circle perimeter, and this cost should be equal to matlab expected variety of pixels on matlab circle boundary. Tr is matlab approved ratio engineering matlab complete number of pixels on matlab feasible circle boundary that determines that matlab circle is engineering real circle. The examine targeted contractors registered in Kenya by matlab National Construction Authority NCA. A sample of 190 respondents was certain through stratified random sampling to take part during this study. Sixteen 16 engineering matlab respondents were from category NCA 1, 12 from class NCA 2, 22 from category NCA 3, 74 from class NCA 4 and 66 from category NCA 5. Senior managers, task managers, technical managers, architects, amount surveyors and engineers working with matlab contractors constituted matlab sample devices for this examine. Ninety eight 98 legitimate questionnaires were again. The look at assessed matlab chance of prevalence of dangers and their affect on task goals when it comes to cost, time, first-rate, atmosphere and fitness and safety; ranked matlab dangers dependent on their significance index rating thus decided matlab key dangers.