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The shortest side of a right triangle measures [tex]\( 3 \sqrt{3} \)[/tex] inches. One angle of the triangle measures [tex]\( 60^{\circ} \)[/tex]. What is the length, in inches, of the hypotenuse of the triangle?

A. 6
B. [tex]\( 6 \sqrt{3} \)[/tex]
C. [tex]\( 6 \sqrt{2} \)[/tex]
D. 3

Sagot :

To determine the length of the hypotenuse of a right triangle when one angle and one side are given, we can use trigonometric relationships. Here’s the step-by-step process:

1. Identify the given information:
- The shortest side of the right triangle is [tex]\( 3 \sqrt{3} \)[/tex] inches. This side is opposite the [tex]\( 60^\circ \)[/tex] angle.
- One angle of the triangle measures [tex]\( 60^\circ \)[/tex]. Since it is a right triangle, the other non-right angle is [tex]\( 30^\circ \)[/tex].

2. Use trigonometric relationships:
For a right triangle:
- [tex]\( \sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}} \)[/tex]

We need to find the hypotenuse [tex]\( c \)[/tex]. Let the shortest side ([tex]\( 3 \sqrt{3} \)[/tex]) be the opposite side for the [tex]\( 60^\circ \)[/tex] angle.

3. Set up the equation using the sine function:
[tex]\[ \sin(60^\circ) = \frac{3 \sqrt{3}}{c} \][/tex]

From trigonometric tables or unit circle, we know:
[tex]\[ \sin(60^\circ) = \frac{\sqrt{3}}{2} \][/tex]

4. Solve for the hypotenuse [tex]\( c \)[/tex]:
[tex]\[ \frac{\sqrt{3}}{2} = \frac{3 \sqrt{3}}{c} \][/tex]

Cross-multiplying to solve for [tex]\( c \)[/tex]:
[tex]\[ c \cdot \frac{\sqrt{3}}{2} = 3 \sqrt{3} \][/tex]

Multiply both sides by 2:
[tex]\[ c \sqrt{3} = 2 \cdot 3 \sqrt{3} \][/tex]
[tex]\[ c \sqrt{3} = 6 \sqrt{3} \][/tex]

Divide both sides by [tex]\( \sqrt{3} \)[/tex]:
[tex]\[ c = \frac{6 \sqrt{3}}{\sqrt{3}} \][/tex]
[tex]\[ c = 6 \][/tex]

Thus, the length of the hypotenuse of the triangle is [tex]\( \boxed{6} \)[/tex] inches.
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