We are given a right triangle with hypotenuse of 12 cm and one angle of 45 degrees. We are asked to find the lengths of the other two sides, $x$ (opposite) and $y$ (adjacent).

GeometryRight TriangleTrigonometrySineCosine45-45-90 Triangle
2025/3/10

1. Problem Description

We are given a right triangle with hypotenuse of 12 cm and one angle of 45 degrees. We are asked to find the lengths of the other two sides, xx (opposite) and yy (adjacent).

2. Solution Steps

We are given that the angle is 45 degrees, the hypotenuse is 12 cm.
We can use the sine function to find the length of the opposite side, xx:
sin(θ)=oppositehypotenusesin(\theta) = \frac{opposite}{hypotenuse}
sin(45)=x12sin(45^\circ) = \frac{x}{12}
x=12sin(45)x = 12 * sin(45^\circ)
Since sin(45)=22sin(45^\circ) = \frac{\sqrt{2}}{2},
x=1222x = 12 * \frac{\sqrt{2}}{2}
x=62x = 6\sqrt{2}
We can use the cosine function to find the length of the adjacent side, yy:
cos(θ)=adjacenthypotenusecos(\theta) = \frac{adjacent}{hypotenuse}
cos(45)=y12cos(45^\circ) = \frac{y}{12}
y=12cos(45)y = 12 * cos(45^\circ)
Since cos(45)=22cos(45^\circ) = \frac{\sqrt{2}}{2},
y=1222y = 12 * \frac{\sqrt{2}}{2}
y=62y = 6\sqrt{2}

3. Final Answer

x=62x = 6\sqrt{2}
y=62y = 6\sqrt{2}

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