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r=2/3h
h=a√3/2 => r=a√3/3=10√3/3
L=2πr=20π√3/3
b)
r=1/3h
h=a√3/2 => r=a√3/6=5√3/6
L=2πr=10π√3/6
R=2/3h
a=10
h= a√3/2
h = 5√3
R= 2/3 *5√3
R= 10/3√3
L= 2πR= 2π10/3√3= 20/3√3
b)
r=1/3 h
a=5
h= 5/2√3
r= 1/3 *5/2√3
r=5/6√3
L=2πr 2π5/6√3= 5/3√3