You have to figure out the two sides. You must have the angles of the triangle and use the sin, cos, and tan functions to figure out the sides. Remember "Oscar Had a Hint of Apples?'
sin (x) = o/h
cos (x) = a/h
tan (x) = o/a
So, if the hypotenuse is the only side known, multiply the sin of the angle of the opposite side by the hypotenuse. This gives you the opposite side.
Then you can divide the tangent of the angle by the opposite side to get the adjacent side.
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That depends on what type of triangle is if the side given is equal to the perimeter divided by 3 then it is an equilateral triangle.
count the grids
You find the three sides of the triangle, and assure that they are all in the same unit, and then add the sides together to find the perimeter of the triangle.
add the sides toghther and then you'll have your perimeter of your triangle
To find the perimeter of a triangle you have to add up all the sides. So to find the perimeter of this triangle you just add 2x+5x+6x=13x. To find the actual perimeter you would have to know what x equals