Question

Giving medal and fan if you solve!

Tina described four triangles as shown below:

Triangle A: All sides have length 12 cm.
Triangle B: Two sides have length 10 cm, and the included angle measures 60°.
Triangle C: Base has length 15 cm, and base angles measure 40°.
Triangle D: All angles measure 60°.

Which triangle is not a unique triangle?

Answer 1

@Luigi0210

Answer 2

I think D. because there is an infinity of triangles which have all three angles, whose amplitude is 60°, namely those triangles are similar each other

Answer 3

thx

need with another one can you help!! :)

Answer 4

I'm ready!

Answer 5

What is the value of x?

http://learn.flvs.net/webdav/assessment_images/educator_mjmath2_v14/05_14_p1_20.jpg

Answer 6

I can't access, may be because I'm not a student!

Answer 7

I can draw it

Answer 8

Ok!

Answer 9

@Michele_Laino

Answer 10

from your drawing, the sum of the amplitudes of the two angles, namely 2x+10, must be equals to 90°, because, that sum between the two angles is equal to a right angle, so:
\[2x+10=90\]
ok!, now adding -10 to both sides of last equation, we have:
\[2x+10-10=90-10\]
or:
\[2x=80\]
finally if I divide the above last equation by 2, I get:
\[\frac{ 2x }{ 2 }=\frac{ 80 }{ 2 }\]
so:
\[x=40°\]

Answer 11

thx so much!

You have a new fan

Answer 12

thank you!

Answer 13

A running track in the shape of an oval is shown. The ends of the track form semicircles.

A running track is shown. The left and right edges of the track are identical curves. The top and bottom edges of the track are straight lines. The track has width 56 m and length of one straight edge 130 m.

What is the perimeter of the inside of the track?

(π = 3.14)

Answer 14

@Michele_Laino