Which of the following could be lengths of the sides of a 30° -60° -90° right triangle? a.) 9 cm, 9 cm, 9√2 cm b.) 10 cm, 20√3 cm, 20 cm, c.) 11 cm, 11√3 cm, 22 cm d.) 7cm, 7√2 cm, 7√3 cm

He trapezoid is composed of a rectangle and two triangles. what is the area of the rectangle? what is the total area of the triangles? what is the area of the trapezoid? ? a) 42 cm2; 27 cm2; 69 cm 2 b) 54 cm2; 27 cm2; 81 cm 2 c) 108 cm2; 27 cm2; 135 cm 2 d) 108 cm2; 13.5 cm2; 121.5 cm 2