What is the approximate perimeter of triangle DEC is rectangle ABCD has a length of 4.6 cm?
+37158 Right triangle with equal leg lengths leg length = 1/2 of 4.6 = 2.3
pythag theorem to find hypotenuse = sqrt ( 2.32 + 2.32) = 3.25
two legs at 3.25 long + 4.6 cm = 11.1 cm perimeter
