Since the rectangle is twice as long as it is tall, the length would be 2 times the height. Therefore, the length is 2 * 5 cm = <<2*5=10>>10 cm.
The area of a rectangle is found by multiplying the length and width.
So, the area of the rectangle is 10 cm * 5 cm = <<10*5=50>>50 square cm. Answer: \boxed{50}.
A rectangle is twice as long as it is tall. It's height is 5 cm. What is its area in square cm
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