1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NemiM [27]
3 years ago
9

Para recortar algumas figuras geométricas, um aluno utilizou uma cartolina com 1mx0,8m. Sabendo que ele recortou 2 triângulos, a

mbos com 20cm de base e 30 cm de altura, 2 trapézios ambos com bases de 10cm e 20cm e altura de 7cm. Determine em cm² quanto foi a área da cartolina que sobrou. * 1 ponto 7595cm² 0,7595m² 7190cm² 0.719m²
Mathematics
1 answer:
Gnom [1K]3 years ago
5 0

Answer:

7190 cm²

Step-by-step explanation:

Para recortar algumas figuras geométricas, um aluno utilizou uma cartolina de 1 m x 0,8m.

Passo 1

Determine a área de todo o papelão

= Temos dimensões = 1mx0,8m

Área = Comprimento × Largura

= 0,8m²

Nós convertemos para cm²

1 m² = 10.000 cm²

0,8m² = x cm²

Multiplicação cruzada

0,8m² × 10.000 cm² / 1 m²

= 8000 cm²

Passo 2

Sabendo que recortou 2 triângulos, ambos com 20cm de base e 30cm de altura

Encontramos a área de um triângulo

= 1/2 × base × altura

= 1/2 × 20 × 30

= 300cm²

Ele cortou 2 triângulos Portanto, o são dos dois triângulos = 300cm² × 2

= 600cm²

etapa 3

Ele também cortou 2 trapézios ambos com bases de 10cm e 20cm e altura de 7cm.

A área de um trapézio =

1/2 (a + b) h

= 1/2 (10cm + 20cm) × 7cm

= 1/2 × 30 × 7

= 105 cm²

Ele cortou dois trapézios, portanto

A área dos dois trapézios do corte = 105cm² × 2

= 210 cm²

Passo 4

A área total do papelão que foi cortado = 600cm² + 210cm²

= 810 cm²

Etapa 5

Determine em cm² quanto de papelão sobrou.

Isso é calculado como:

Área total do papelão - Área total que foi cortada

= 8000 cm² - 810 cm²

= 7190 cm²

You might be interested in
What is the equation of a line that has a slope of -2/3 and passes through the point (-3, -1)?
valentinak56 [21]

Answer:

d d d d d d d d d d d d d d d  d d dd  d d d

Step-by-step explanation:

d d d d d d d d d d d d  d d d d d d d d d d  d d d d d d d d d d d d d d d d d  d d d d d  d d d d d d d d  d  d d d d d d d d  d d d d d

5 0
3 years ago
You want to buy a video game that costs $129.96. Estimate the total cost if the sales tax rate is 7%.
Zarrin [17]

I think it’s 9.10 but I’m not really sure

6 0
3 years ago
Suppose Q and R are independent events. Find P(Q and R) if P(Q) = 0.63 and P(R) = 0.48.
Oksanka [162]
Hello,

Q and R are independent if p(Q and R)=p(Q)*p(R)
Here p(Q and R)=0.63-0.48=0.3024
ANSWER B
5 0
3 years ago
Read 2 more answers
The drama club is having a car wash as a fundraiser. They wash x cars at $5 each
Galina-37 [17]

<u>Answer:</u>

x + y ≥ 26 + 15

5x + 8y ≥ 250 (see below)

Step-by-step explanation:

First, write an equation to represent the total cost to wash cars:

$5x = cost for cars

Then, write another for trucks:

$8y = cost for trucks

If the question is saying that they will wash at least 26 cars and 15 trucks, that means they could wash more. This means that we'll need an inequality:

This inequality represents that the total number of cars and trucks they wash will be at least—which means that it is equal to or greater than—than the amount given:

x + y ≥ 26 + 15

Any equation or inequality with two unknowns is not solvable, meaning we need a system of equations:

If they make at least $250, that means that we need to combine the costs of the cars and trucks to make an inequality:

5x + 8y ≥ 250

Now you have your system of equations:

x + y ≥ 26 + 15

5x + 8y ≥ 250

8 0
3 years ago
Can someone plz help ASAP this is confusing
mr_godi [17]

Answer:

third option

Step-by-step explanation:

four times a number: 4n

add 8 to it: 4n + 8

All of this equals to -12.

Hence: 4n + 8 = -12

6 0
3 years ago
Read 2 more answers
Other questions:
  • Horace is a professional hair stylist. Let CCC represent the number of child haircuts and AAA represent the number of adult hair
    10·1 answer
  • Find the percent of the number. What is 256% of 75
    6·2 answers
  • A journalist interviews 123 people after they leave a restaurant and asks them how confident they are that the food is safe.
    6·1 answer
  • A child weighs 83 pounds. Given that 1 pound is equal to 16 ounces, how many ounces does the child weigh? A. 1,228 ounces B. 1,3
    10·1 answer
  • Which of the following expressions are equivalent?
    13·1 answer
  • Leila bought 4 CDs that were each the same price. Including sales tax, she paid a total of 58.80. Each CD had a tax of 0.90. Wha
    14·1 answer
  • A school is arranging a field trip to the zoo. The school spends 757 Point $76 on passes for 34 students and three teachers. The
    7·1 answer
  • Need help asap will give brainly
    9·1 answer
  • Round answer to the nearest hundredth
    6·2 answers
  • Can someone please help me with this?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!