Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Question 1: If sinA=3/5 and cosA< zero ,then tan A= ???

Options(0.75,-0.66,-0.80,0.80)

Question 2: For any triangle if tangent of any internal angle=0 then the area of triangle is

Options(Zero,Infinity,Undefined,Not sure)

Question 3 : Which of the following about set of primes is not true

Options(Subset of Z,Finite,Odd except 1,Cannot divide each other)

I Think it is odd except 1 this option is not true

Give ans or send me link of this topic

MZk

Offline

For question 1, must be negative (do you see why?). It seems to me that the answer should be , which is not listed.For question 2, gives or . This corresponds to three collinear points.For question 3, clearly all primes are integers, so they must be a subset of , and by definition, none of them divide each other. For the "odd except 1" statement, is a prime number, and isn't a prime number either, so this statement can't be true. There are also infinitely many primes -- so it seems there are two false statements listed. Did you mean to write "odd except 2"?

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Odd except ** First **

*Last edited by Zeeshan 01 (2017-08-01 00:16:42)*

MZk

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Q 1 how you bring ans of tan

Q 2 area of triangle??

MZk

Offline

Zeeshan 01 wrote:

Odd except 1

In that case, there are two false statements.

Zeeshan 01 wrote:

Q 1 how you bring ans of tan

Use the fact that (3,4,5) is a Pythagorean triple.

Zeeshan 01 wrote:

Q 2 area of triangle??

What's the area of a triangle whose points all line on a straight line?

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

Offline

Zeeshan 01 wrote:

Odd except

First

OK, in that case, there is only one false statement: the finiteness claim.

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Tan A why Negative>>????

MZk

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

odd except first is only wrong???

what is except first mean??

MZk

Offline

Zeeshan 01 wrote:

Tan A why Negative>>????

Alternatively you can see this by drawing a triangle.

Zeeshan 01 wrote:

That is a correct statement. It is claiming that all prime numbers, apart from the first prime number (that's ) are odd. The only statement which is not true is the 'finite' statement.
odd except first is only wrong???

what is except first mean??

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

prime numbers is infinite

MZk

Offline

Yes, exactly.

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

yes ans is 0.75 but negative is not in option

MZk

Offline

If the answer were , then that would imply that (i.e. that it is positive).

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Question 2

MZk

Offline

Yes, what do you think the area of a triangle with all its points on a line could be?

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

0.8 is greater than zero 4/5

MZk

Offline

Yes, which contradicts the assumption that

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

So what to do??

MZk

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

In this question

MZk

Offline

I don't think any of the options listed are correct. The first option seems closest, though it has the wrong sign.

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Ok area of triangle is half b×h

MZk

Offline

So what is the area of the triangle in this case, do you think?

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

What is tangent of interior angle

MZk

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 650

Can u draw?

MZk

Offline

The interior angle is just the angle between two sides.

By 'tangent', they mean . That is, if is the interior angle, they're asking you about .

New: Integration Problem | Adding Fractions

Popular: Continued Fractions | Metric Spaces | Duality

Offline