All categories

3 years ago

The sum of the measure of the interior angles of a polygon is 1980°. What polygon is it?

Mathematics

1 answer:

Gwar [14]3 years ago

8 0

Answer:

tridecagon/triskaidecagon

Explanation:

sum of interior angles= 180(n−2) degrees, n being the number is sides in the polygon.

sum of interior angles= 1980

180(n−2)=1980

divide by 180:

n−2=1980180=11

add 2:

n=11+2=13

If a polygon has 13 sides, it is called a tridecagon or a triskaidecagon.

You might be interested in

I think it's either C or D but I'm not sure plzzz help me !?!?!?!

Dennis_Churaev [7]

Using th epythagorean theorem.

52^2-48^2= x^2

2704-2304= x^2

400=x^2

x=20

Final answer: D

3 0

3 years ago

If Johnny borrowed $1,300 for 5 years on a 7% interest rate, how much interest will Johnny have to pay total?

Ghella [55]

Answer:

฿₹Ø: 1391 US$

Step-by-step explanation:

8 0

2 years ago

Solve 2x^3+7x^2-2x-1=o

Mashcka [7]

Answer:

$x=\sqrt{3}-2\\x=-\sqrt{3}-2\\x=\frac{1}{2}$

Step-by-step explanation:

This is a hard one

We have to use the rational root theorem

$2x^3+7x^2-2x-1$ = 0

We have to find all the factors of a and d and put them in a fraction

$a=2\\d=-1\\\frac{1}{1,2}$

We then plug them into the equation to see if any of them work

The equation isn't true when plugging 1, but is true when plugging in 1/2

factored form of 1/2 is (2x-1)

Then we divide the original equation by (2x-1) (you can use synthetic division or long division, it would be hard to type out the process for that) to get $x^2+4x+1$

So now the equation is $(2x-1)(x^2+4x+1)$

Solve the second half of this equation using the quadratic formula to get

$\sqrt{3}-2$ and $-\sqrt{3}-2$

We already know the solution for the first half of the equation (1/2)

So the final answers are:

$x=\sqrt{3}-2, -\sqrt{3}-2, \frac{1}{2}$

8 0

3 years ago

The minimum point of the graph y = 2x^2 + 2x +1 is located at:

slega [8]

Answer:

Step-by-step explanation:

By completing the square, y = 2x^2 + 2x +1 will be y=2(x+1/2)^2+(1/2) the minimum point is the vertex of the parabola which is (-1/2, 1/2)

8 0

3 years ago

Can u help me answer that question

leva [86]

Answer:

I dunno

Step-by-step explanation:

You cant see the words lol

3 0

3 years ago