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Question
12.) ∠yxz = 58°, xz = 4, and xy = 7.5. find the length of yz. round to the nearest tenth.
Explicación:
Paso 1: Aplicar la ley de los cosenos
La ley de los cosenos para $\triangle XYZ$ es $YZ^{2}=XY^{2}+XZ^{2}-2\cdot XY\cdot XZ\cdot\cos(\angle YXZ)$.
Sustituimos $XY = 7.5$, $XZ = 4$ y $\angle YXZ=58^{\circ}$.
$YZ^{2}=7.5^{2}+4^{2}-2\times7.5\times4\times\cos(58^{\circ})$
Paso 2: Calcular los términos individuales
$7.5^{2}=56.25$, $4^{2}=16$.
$\cos(58^{\circ})\approx0.5299$.
$2\times7.5\times4\times\cos(58^{\circ})=60\times0.5299 = 31.794$.
Paso 3: Calcular $YZ^{2}$
$YZ^{2}=56.25 + 16-31.794$
$YZ^{2}=40.456$
Paso 4: Encontrar $YZ$
$YZ=\sqrt{40.456}\approx6.4$
Respuesta:
$YZ\approx6.4$
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Explicación:
Paso 1: Aplicar la ley de los cosenos
La ley de los cosenos para $\triangle XYZ$ es $YZ^{2}=XY^{2}+XZ^{2}-2\cdot XY\cdot XZ\cdot\cos(\angle YXZ)$.
Sustituimos $XY = 7.5$, $XZ = 4$ y $\angle YXZ=58^{\circ}$.
$YZ^{2}=7.5^{2}+4^{2}-2\times7.5\times4\times\cos(58^{\circ})$
Paso 2: Calcular los términos individuales
$7.5^{2}=56.25$, $4^{2}=16$.
$\cos(58^{\circ})\approx0.5299$.
$2\times7.5\times4\times\cos(58^{\circ})=60\times0.5299 = 31.794$.
Paso 3: Calcular $YZ^{2}$
$YZ^{2}=56.25 + 16-31.794$
$YZ^{2}=40.456$
Paso 4: Encontrar $YZ$
$YZ=\sqrt{40.456}\approx6.4$
Respuesta:
$YZ\approx6.4$