What is the area formula for a parallelogram?
textbasetimestextheight\\text{base} \\times \\text{height}textbasetimestextheight
frac12timestextbasetimestextheight\\frac{1}{2} \\times \\text{base} \\times \\text{height}frac12timestextbasetimestextheight
textlengthtimestextwidth\\text{length} \\times \\text{width}textlengthtimestextwidth
frac12timesd1timesd2\\frac{1}{2} \\times d_1 \\times d_2frac12timesd1timesd2