Question

*Can someone tell me if I did it the right way and how do I round my answer to the nearest inch?*Claire is designing a decagon street sign. She wants to place the street sign in her front yard to announce her graduation party. She wants her sign to have a height of 40 inches and each side to measure 14.5 inches. What is the area of the stop sign, rounded to the nearest square inch?
URL picture: https://cds.flipswitch.com/tools/asset/media/472755
The equation I use is this one : A=1/2*20*14.5(10) and the answer I got which is the area is 1,450.

Answer 1

Hey @jhonyy9, Can you check this and see if I did it right please? Also, if you know how to round the answer I got to the nearest square inch.

Answer 2

so do you know what mean exactly decagon - how many similar triangles inside this poligon ?

Answer 3

Yeah I think so :)

Answer 4

so than you know this 40 in what is - what mean for one from these triangles - so you can calculi area of one from these triangles - so than you know again the length of base of this triangles - do you know it ?

Answer 5

Is it going to be 20?

Answer 6

how many degree will result for a central angle of this triangle of a decagon ?

Answer 7

so do you know it ?

Answer 8

Is it 36 degrees? I don't know it

Answer 9

yes right bc. you get it from 360/10 = 36

Answer 10

ohh okay, Got it!

Answer 11

Then, what do we do next?