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If a, b, and θ are two sides and an included angle of a parallelogram, the area of the p.gram is ab(sin)θ?

True or False...
Please tell me why.

True.

area of the parallelogram is height times width. To find the height you drop a vertical from one of the sides and use some trig. The height is a*sin(theta) or b*sin(theta) depending on your construction. Either way we get that formula.