You use the Pythagoras Theorem if it is a right-angled triangle. a squared + b squared = h (longest side, diagonal) squared, then square root h to find the longest side. if it is not a right angled triangle, then use the Sine or Cosine rule. Sine rule for: two angles and any one side or two sides and an angle that is not in between the sides. Cosine rule for: all three sides (but then you do not need to find a missing side) or two sides and an angle that is in between.
No.
180 minus two known angle = missing angle. Use Pythagoras' theorem to find its missing side.
Since 2 of it's angles are equal (45 degrees), you have an isoceles triangle. Hence, two of its sides are the same. Since the other angle is 90, you have a right angle triangle. This means that if you're missing the hypotenuse, you can use the Pythagorean theorem to find it. H^2 = A^2 + B^2 Where H is the length of the hypotenuse, and A and B are the lengths of the other 2 sides. (Here, A = B).
add all of the sides together
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The way to find the missing side of a triangle-THIS ONLY WORKS ON RIGHT ANGLED TRIANGLES-is square both sides seperately and then add them together to give you the square of the missing side-find the square root and that is the size of the missing side-eg. if you have a RIGHT ANGLED TRIANGLE with sides of 3inch and 4inch then (3x3) + (4x4) = 25 so the square root of 25 is 5 meaning the missing side is 5inch.
A triangle always has 180 units. You would have to add up the two sides and subtract that from 180.
to find the missing side of a right triangle you need the pythagorean theorem. A2 + B2 = C2. c is the longest side and a and b is the other sides. no particular side is a or b just the longest side is c.
180-x-y (x and y are the sides you already know) there are 180 degrees in a triangle. The remaining # is the last angle
Surely you know how to find the third side of a right triangle, when you know the lengths of the other two. Find it, and then add up the lengths of the three sides to get the perimeter.
Use two sides and Pythagoras's theorem to work out the third side. Then simply add the three sides.
You use the Pythagoras Theorem if it is a right-angled triangle. a squared + b squared = h (longest side, diagonal) squared, then square root h to find the longest side. if it is not a right angled triangle, then use the Sine or Cosine rule. Sine rule for: two angles and any one side or two sides and an angle that is not in between the sides. Cosine rule for: all three sides (but then you do not need to find a missing side) or two sides and an angle that is in between.
Having sufficient angles or sides one can use either, The Law of Sines, or, The Law of Cosines. Google them.
Pythagorean Theorem: a2 + b2= c2 where c is the hypotenuse of a right triangle. Hypotenuse is the side of a right triangle opposite to the right angle.
It involves a right triangle. If a length is missing in a right triangle, you can find it out by using the other two lengths.
No.