half of base times altitude.
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It can be but need not be.
Right triange with both sides around the 90 degrees = 4 with a right trianle the area = 1/2 * height * width (think of it as half a rectangle)
A triangle has three sides and three angles. Right angled triangles are triangles in which the measure of one angle equals 90 degrees
A plane (flat) shape with three sides is called a "triangle".Notice that if it has three sides, then it must have three angles.
To find the perimeter you add and to find the area we multiply.