Area of triangle: (0.6+ 1) × 2× 3 ÷ 4 = 4.8 (square centimeter).

Trapezoidal area: (1× 2+(1+2.3) × 2 )× 3 ÷ 2 =12.9 (square centimeter).

Trapezoidal area: (2.3× 2× (4+1)× 2 )× 3 ÷ 2 = 21.9 (square centimeter).

Rectangular area: 6× 2 = 12 (square centimeter)

Small tree area: 4.8+12.9+21.9+12 = 51.6 (square centimeter).

(2) To make a small tree, you need a rectangular piece of handmade paper, with a length of 15cm, a width of 10cm and an area of 15× 10= 150 (square cm). The area of this handmade paper is 45× 2 1 = 945 (square centimeter).