If it is a right triangle, you can use the Pythagorean Theorem. If you know the angle measures, you can use cosine/sine/tangent.
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.
If a figure has four sides, then it is a quadrilateral; it cannot be a triangle.
It is a triangle
square
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.
If a figure has four sides, then it is a quadrilateral; it cannot be a triangle.
If a figure is not a triangle then it does not have three sides ,is the contrapositive of the statement given in the question.
It is a triangle
A figure with twice as many sides as a triangle is a hexagon. A triangle has 3 sides, so double that would be 6 sides. A hexagon is a polygon with 6 sides and 6 angles. It is a regular polygon with all sides and angles congruent.
No. Every triangle has 3 sides, and every figure with 3 sides is a triangle. So no triangle can be a parallelogram. Every parallelogram has 4 sides, and every figure with 4 sides is a quadrilateral. So no parallelogram can be a triangle.
square
Triangle
A triangle.
A triangle
triangle