The circumference of isosceles triangle is 28.5cm, whose height is 6.4cm, and what is its area

The circumference of isosceles triangle is 28.5cm, whose height is 6.4cm, and what is its area

Let the waist length be x and the bottom length be 28.5-2x
x²-[（28.5-2X）/2]²=6.4²
X=8.56
28.5-2X=11.38
S=1/2*11.38*6.4=36.42cm²

If the median line length of an isosceles trapezoid is 6cm and the waist length is 5cm, then the circumference of the trapezoid is 5cm______ cm．

According to the median line theorem of trapezoid, the sum of the upper and lower base of trapezoid is 12. So the circumference is 12 + 10 = 22 (CM)

If the waist length of isosceles trapezoid is 6cm and the median line length is 5cm, what is the circumference

Perimeter = 2x5 + 6x2 = 22cm