Find the perimeter of the rectangle if you know the area of the triangle and the side. The width is 2 dm and the area of the (right-angled) triangle S = 8 dm2
A rectangle is a rectangle with equal opposite sides and right angles.
Its area (numerical characteristic of a two-dimensional geometric figure) is calculated by the formula:
S = a * b. Provided that this value is 8 dm², and the width = 2 dm, we express the length (to find the first factor, divide the product by the second:
a = S: b = 8: 2 = 4 dm.
The perimeter is the sum of all sides. For a rectangle, it is determined by the formula:
P = 2a + 2b = 2 * 4 + 2 * 2 = 8 + 4 = 12 dm.
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