Question

Polygon.... PLease help..Fan and medal...

Answer 1

something like that.

Answer 2

A.
concave quadrilateral

B.
convex quadrilateral

C.
concave pentagon

D.
convex pentagon

Answer 3

okay We can eliminate A.

Answer 4

Could it be C?

Answer 5

Correct, A and B are eliminated since the shape has FIVE sides.
PENTA = FIVE

Now you just have to choose between C and D. Whether the pentagon is convex or concave.

Answer 6

We can eliminate also D. so it would be C?

Answer 7

A convex pentagon has no angles pointing inwards. More precisely, no internal angles can be more than 180°.

When any internal angle is greater than 180° it is concave. (Think: concave has a "cave" in it)

Source: http://www.mathsisfun.com/geometry/pentagon.html

So yes, I agree C is the best choice.

Answer 8

Yes Thank you!!

Answer 9

wait one more please?

Answer 10

Sure, why not. :-)

Answer 11

thanks..umm ok.
What is the sum of the interior angles of a decagon?

A.
1800°

B.
1620°

C.
1440°

D.
1260°

Answer 12

now this one i have no idea.

Answer 13

Decagon: From Greek deka "ten" + gonia "angle".

We know one interior angle is 144° and that a decagon has ten sides so:
\[144° \times 10 = 1440°\]

Answer 14

So you multiply practcilly?

Answer 15

ohh ohh.

Answer 16

Yes, practically all I did was multiply.

Answer 17

ohh thanks that was the last question thanks.

Answer 18

No problem, glad to help. :-)