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miss Akunina [59]
3 years ago
8

Which statement is NOT true about a rhombus?

Mathematics
2 answers:
Nady [450]3 years ago
7 0
<h3>Answer:   C) It has four congruent angles</h3>

=======================================================

Explanation:

A) This statement is true, so we can rule it out. A rhombus by definition has four sides the same length. Think of a square but the sides can be slanted or the angles could be something different from 90 degrees.

B) This statement is true. The opposite sides of a rhombus are always parallel. Any rhombus is always a parallelogram, but not the other way around.

C) False. This is the answer. We could have a square, and in which case we have four congruent angles. But we could slant the sides and have the angles be something else. All that matters is that all four sides are the same length.

D) True. Any rhombus is a parallelogram as mentioned in part B. However, some parallelograms are not a rhombus. Consider any rectangle in which the length and width are not the same. The sides are parallel, but we don't have all four sides the same length.

padilas [110]3 years ago
5 0

Answer:

C. It has four congruent angles.

Step-by-step explanation:

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Give triangle abc is congruent to triangle def find x
Karolina [17]

Answer:

x=9

Step-by-step explanation:

FE is 3x-7

since ΔABC≅ΔDEF the equivalent of FE is CB, or BC...which is 20

3x-7=20

3x=27

x=9

6 0
3 years ago
Could I plz plz have help with factorising this quadratics(not using quadratic formula)
spin [16.1K]

(x-3)^2=(3x+10)*(x-3) so to solve this u can simply take (x-3) over to the other side so it will; look like this

(x-3)^2/(x-3)=3x+10

then it will be x-3=3x+10

-2x=13

x=-13/2 which is -6.5


7 0
4 years ago
The sum of 6 times a number and 8 times another number is 12. The difference of those numbers is 9. What are the two numbers
Inga [223]

Answer:

(x,y): (6 , -3) or (-30/7 , 33/7)

Step-by-step explanation:

6x + 8y = 12

x = y + 9 or   y = x+ 9

if x = y+9

6*(y+9) + 8y = 12

14y = -42

y = -3 and x = 6

if y = x+9

6x + 8*(x+9) = 12

14x = -60

x = -30/7   and y = 33/7

6 0
3 years ago
A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.
irinina [24]
Black F 19. I HOOKUP ! $100 & less. Deposit required . I CAN VERIFY
7 0
3 years ago
Need Help Asap!!!!!!
Hatshy [7]

This is a right triangle (you can confirm by using Pythagorean Theorem: 15² + 36² = 39²)

A = \frac{1}{2} b * h

A = \frac{1}{2} 15 * 36

   = 15 * 18

   = 270

Answer: 270 cm²

7 0
3 years ago
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