Use a special right triangle to express sin 45 degrees as a fraction

Step-by-step explanation:

in a right angled triangle angles given are 45,90

Then third angle is also 45 °

as two angles are 45° each.

Then sides are also equal.

Let the equal sides be each = x

then hypotenuse=√ (x²+x²) = √ (2x²) = x√2

sin 45°=x / (x√2) = 1/√2