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A diamond-shaped kite is made, in which each of its sides measures 30 centimeters and its smaller diagonal measures 36 centimeters. How many square meters of plastic will be needed to make the kite?

Question

A diamond-shaped kite is made, in which each of its sides measures 30 centimeters and its smaller diagonal measures 36 centimeters. How many square meters of plastic will be needed to make the kite?

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Solution

Para resolver este problema, primero necesitamos encontrar el área del rombo (la forma del cometa). Sabemos que un rombo tiene dos diagonales que se cruzan en ángulos rectos y que el área de un rombo se puede calcular usando la fórmula:

Aˊrea=D1×D22 \text{Área} = \frac{D_1 \times D_2}{2}

donde D1 D_1 y D2 D_2 son las longitudes de las diagonales.

En este caso, conocemos la longitud de la diagonal menor (D1=36 D_1 = 36 cm), pero no conocemos la longitud de la diagonal mayor (D2 D_2 ). Sin embargo, podemos encontrar D2 D_2 usando el hecho de que los lados del rombo miden 30 cm cada uno.

Dado que las diagonales de un rombo se bisecan mutuamente en ángulos rectos, podemos dividir el rombo en cuatro triángulos rectángulos iguales. Cada uno de estos triángulos tiene como catetos la mitad de las diagonales (D12 \frac{D_1}{2} y D22 \frac{D_2}{2} ) y como hipotenusa el lado del rombo (30 cm).

Entonces, podemos usar el teorema de Pitágoras en uno de estos triángulos rectángulos:

(D12)2+(D22)2=302 \left( \frac{D_1}{2} \right)^2 + \left( \frac{D_2}{2} \right)^2 = 30^2

Sustituyendo D1=36 D_1 = 36 cm:

(362)2+(D22)2=302 \left( \frac{36}{2} \right)^2 + \left( \frac{D_2}{2} \right)^2 = 30^2

182+(D22)2=302 18^2 + \left( \frac{D_2}{2} \right)^2 = 30^2

324+(D22)2=900 324 + \left( \frac{D_2}{2} \right)^2 = 900

Restamos 324 de ambos lados:

(D22)2=576 \left( \frac{D_2}{2} \right)^2 = 576

Tomamos la raíz cuadrada de ambos lados:

D22=24 \frac{D_2}{2} = 24

Multiplicamos por 2 para encontrar D2 D_2 :

D2=48 cm D_2 = 48 \text{ cm}

Ahora que tenemos ambas diagonales, podemos calcular el área del rombo:

Aˊrea=36×482 \text{Área} = \frac{36 \times 48}{2}

Aˊrea=17282 \text{Área} = \frac{1728}{2}

Aˊrea=864 cm2 \text{Área} = 864 \text{ cm}^2

Finalmente, convertimos el área de centímetros cuadrados a metros cuadrados:

864 cm2=864×104 m2 864 \text{ cm}^2 = 864 \times 10^{-4} \text{ m}^2

864 cm2=0.0864 m2 864 \text{ cm}^2 = 0.0864 \text{ m}^2

Por lo tanto, se necesitarán 0.0864 metros cuadrados de plástico para hacer el cometa.

This problem has been solved

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