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Question
- a circular track surrounds a lake and has a radius of 3 miles. during a charity event, tanya walks from one side of the lake to the opposite side. how far does she walk?
- mr. quinones is covering a rectangular dinner table with clear acrylic. the table measures 7 feet long and 36 inches wide. if the polish acrylic cost $16 per square foot, what is the total cost to cover the table?
- a circular jogging loop in a city park has a radius of 5 km. marcos runs around the loop four complete laps during his morning workout. if in average, he burns 5 calories per km. what are the total calories that he burns in the workout?
- a warehouse floor measures 150 feet in length and 80 feet in width. the manager wants to get the permit from the fire department, and they charge for the inspection $75 plus $0.02 per square foot. what will be the total payment for the fire department?
- erick is designing a circular logo to be printed on a t - shirt. the logo has a diameter of 8 inches and will be printed on a square sheet of paper with an area of 64 square inches. how many square inches of the paper will remain unused?
1.
Step1: Encontrar el diámetro
El diámetro \(d\) de un círculo se calcula como \(d = 2r\), donde \(r\) es el radio. Dado que \(r=3\) millas.
\(d = 2\times3\)
Step2: Calcular la distancia
\(d = 6\) millas
Step1: Convertir la unidad de ancho
Dado que 1 pie = 12 pulgadas, entonces 36 pulgadas \(=\frac{36}{12}=3\) pies.
Step2: Calcular el área del rectángulo
El área \(A\) de un rectángulo es \(A = l\times w\), donde \(l = 7\) pies y \(w = 3\) pies. \(A=7\times3 = 21\) pies cuadrados.
Step3: Calcular el costo total
El costo por pie cuadrado es de \(16\) dólares. Entonces el costo total \(C=16\times21\)
\(C = 336\) dólares
Step1: Calcular la circunferencia del círculo
La circunferencia \(C\) de un círculo es \(C = 2\pi r\), donde \(r = 5\) km. \(C=2\times\pi\times5=10\pi\) km.
Step2: Calcular la distancia total recorrida
Marcos corre 4 vueltas. Entonces la distancia total \(D=4\times C=4\times10\pi = 40\pi\approx40\times 3.14 = 125.6\) km.
Step3: Calcular las calorías quemadas
Borra 5 calorías por km. Entonces las calorías totales \(E=5\times D\)
\(E=5\times125.6 = 628\) calorías
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6 millas
2.