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
astra-53 [7]
3 years ago
9

What is the area of triangle DEF

Mathematics
1 answer:
kolezko [41]3 years ago
3 0

Answer:

76.5 cm²

Step-by-step explanation:

Given the triangles are similar , then

ratio of sides = a : b , so

ratio of areas = a² : b²

Here ratio of sides = 9 : 13.5 = 2 : 3

ratio of areas = 2² : 3² = 4 : 9

let x be the area of Δ DEF and using proportion

\frac{4}{34} = \frac{9}{x} ( cross- multiply )

4x = 306 ( divide both sides by 4 )

x = 76.5

The area of Δ DEF = 76.5 cm²

You might be interested in
What is -3 - (-1)?? please help
irinina [24]

Answer:

The negative of a negative is a positive. You can rewrite the equation as -3+1. So, the answer is -2.

:)

7 0
2 years ago
Read 2 more answers
If y varies directly as x, and y is 16 when x is 4, when y= 24 what is the value of x?
sergejj [24]

Answer:

x = 6 possibly

Step-by-step explanation:

I am just an algebra student, but if I am correct I would appreciate a crown.

16/4 is 4, so i assumed that was the geometric pattern, so i divided 24 by 4 and got 6.

Hoped this helped.

6 0
3 years ago
A school purchases boxes of candy bars.
Cloud [144]

Answer:

$0.20 per candy bar

Step-by-step explanation:

There are 50 candy bars per box. It's costing the school $30/50=$0.60 per candy bar to buy. The school sells each candy bar for $0.80, making a profit of $0.20 per candy bar.

3 0
3 years ago
$32 earrings marked up 20% ,,, I need explanation on how to figure out??
Ludmilka [50]
32*1.2=38.4 (.2 is the 20%, and the 1 adds the percent to the original cost making it a mark up)
5 0
3 years ago
One week, Steph worked 20 hours, Marco
garik1379 [7]

Answer: 9

Step-by-step explanation:

Add 20, 12, and 32 together then divide by 7 because it says "One week" and a week is 7 days. So, it should be like 20 +12 + 32= 64

64 / (divided by) 7 = 9

4 0
2 years ago
Other questions:
  • 331/3% of what number is 57
    12·1 answer
  • What is the area if the radius is 11.7
    12·1 answer
  • I would really like help please
    9·1 answer
  • Write an equation from the following points (plug in the numbers you would use for "m" and "b"):
    6·1 answer
  • (If gets it right get's brainliest)If the hypotenuse of an isosceles right triangle is 14, what is the area of the triangle?
    6·1 answer
  • What is the solution set of the equation 3x^2+23x-8=0
    7·1 answer
  • The point (5,3) lies on the terminal side of an angle in standard position. Select all
    9·1 answer
  • At 1:00am the temperature was 87 degrees. A cold front came through and at 7:00pm the temperature was 45 degrees. What is the ra
    12·1 answer
  • Given: Parallelogram QRST where QR = 6X - 5<br> and RS = 4x + 13. What is the length of QT?
    10·1 answer
  • Which is the slope of the lime that passes through the points (2, 8) and (4, 6)?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!