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Cerrena [4.2K]
4 years ago
10

Which counterexample shows that the conjecture "Every parallelogram is also a rectangle" is false?

Mathematics
2 answers:
mafiozo [28]4 years ago
5 0
A parallelogram without four right angles would prove that to be false.
Ivanshal [37]4 years ago
3 0
Yep that'd be false since they are also rectangles
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A quilted block users eight parallelogram shaped pieces of clothe each with a base of 3/3/4 inches. How much fabric is needed to
borishaifa [10]

Answer:

The answer to the question is

37.5 ft² of fabric is needed to make the parallelogram pieces for 24 blocks.

Step-by-step explanation:

To answer the question, we note that  a parallelogram is a four sided polygon having two opposite parallel sides.

Therefore in this question, we select our parallelogram to be a rectangle

Number of pieces of parallelogram in a quilted block = 8

Number of parallelogram in each quadrant of the quilted block = 2

Therefore the height of the rectangle = 2 × the base = 2×3\frac{3}{4} = 7.5 inches

Therefore the area of each parallelogram = base × height

= \frac{15}{4}*\frac{15}{2} = \frac{225}{8} in²

since each quilted block uses 8 parallelogram, then the amount of fabric for each quilted block is

\frac{225}{8} *8 = 225 in^2

Hence 24 blocks wil require 24×225 in² = 5400 in²

However, since 144 in² = 1 ft² we have

5400 in² = 5400 in²× 1/144  ft²/in² = 37.5 ft².

7 0
4 years ago
Teams of 4 are competing in a 1/4 mile relay race. Each runner must run the same exact distance. What is the distance each teamm
PSYCHO15rus [73]


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3 years ago
Question:<br> 15-4+ (7 - 5)
GREYUIT [131]

Answer:

13

Step-by-step explanation:

15 - 4 + 7 - 5 = 13

Simply expand the brackets and subtract and add accordingly.

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4/6, 7/12, 5/10
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In order from least to greatest: 
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