Yes providing that it's an equilateral triangle or a right angle isosceles triangle.
The answer will depend on whether the length is the hypotenuse or one of the legs of the triangle.
If the given length is the measure length of the base of the triangle, then the area of the triangle is: A = (bh)/2 = (10 x 20)/2 = 100.
The way you can work out the length of a triangle is if you are given the height and the area of that triangle ( this works of you don't want to measure it) or you could just measure it.
As the relationship between the length and angle given are unclear a graphic explanation can be found at the link below
If the triangle is equilateral, you simply divide the perimeter by three to find the length of each side. If the triangle is not equilateral, you will need more information to determine the length of each side.
equal lateral
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You do not indicate if the given area is the total area of the square and the triangle. Or whether they are equal values.
If you have the length of each of the three sides of a triangle, you can find the perimeter of (the distance around) the triangle by adding the length of the sides. Their sum will be the perimeter of this geometric shape.
That will depend on its dimensions which have not been given but 2 of its 3 sides will be equal in length
Yes, the Euclidean distance is the length of the hypotenuse of the right angled triangle whose other two vertices are at the two given points.
Side length is about 12 units (11.99963) given an area of 62.35