Question

a) Joey used 10 congruent triangles to create a regular decagon.

What kind of triangles is he using?

b)Joey used 10 congruent triangles to create a regular decagon.

Find the three angle measures of one of the triangles. Explain how you know.

c)Joey used 10 congruent triangles to create a regular decagon.

If the area of each triangle is 14.5 square inches, then what is the area of the regular decagon? Show all work.

Answer 1

Hint: He used 36-54-90 triangles

Answer 2

right triangle?

Answer 3

I guess I'm thinking wrong because I'm thinking of 10 isosceles triangles with vertex angle 36 and base angles 72.

Answer 4

Yeah, I messed up somewhere. It was bad visualization on my part

Answer 5

so isosceles?

Answer 6

Then the total area would be 14.5(10) or 145

Answer 7

before we do c what is b

Answer 8

Then the total area would be 14.5(10) or 145

Answer 9

b. I guess I'm thinking wrong because I'm thinking of 10 isosceles triangles with vertex angle 36 and base angles 72.

Answer 10

dont u need 3 angle mesasures? not 2?

Answer 11

???

Answer 12

I guess I'm thinking wrong because I'm thinking of 10 isosceles triangles with vertex angle 36 and base angles 72.

Answer 13

How many angles is a vertex angle and 2 base angles???????

Answer 14

i dont know but this is what b says
b)Joey used 10 congruent triangles to create a regular decagon.

Find the three angle measures of one of the triangles. Explain how you know.