Triangles

Hanka cut the 20 cm long straws into three pieces each piece had a length in cm. Then, with these three pieces, she tried to make a triangle.

a) What circuit has each of the triangles?
b) How long can the longest side measure?
c) How many different triangles could be made?

Correct result:

o =  20 cm
a =  9 cm
n =  8

Solution:

o=20=20 cm
a+b+c=20 a<b+c 9<9+2 a=9=9 cm
2,9,9 3,8,9 4,7,9 4,8,8 5,6,9 5,7,8 6,6,8 6,7,7  n=8



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