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(Copy and Paste the links)
+129899 Second one
This is a 30-60-90 right triangle
The side across from the 30 degree angle = (1/2) * hypotenuse = (1/2) * 6 = 3 = y
Third one
In a 45-45-90 right triangle, the hypotenuse is √2 times either of the legs =
5√2 = r
Fourth one :
The side across from the 30 degree angle = 3
x is across from the 90 degree angle in the second triangle = 3√2
