A. It is a parallelogram so, the formula is just simple base × height; 16cm × 9cm = 144cm²
B. It is a trapezoid so, the formula is base1 + base2 ÷ 2 × height; 25cm+ 44.67cm= 69.67cm ÷ 2 = 34.835cm × 20cm= 696.7cm²
C and D are irregular shapes - the diagram will show you how to do them...