1.
r = 2PΔ/(a+b+c)
2PΔ = r(a+b+c) /:2
PΔ = ½r(a+b+c)
PΔ = ½ah = ½r(a+b+c)
½r(5+12+13) = ½·5·12
15r = 30 /:15
r = 2 cm
Odp.D. 2 cm
2.
xw = -b/2a = -(-8/8) = 8/8 = 1
x-1 = 0
Odp.B. x-1 = 0
3.
Odp.A, bo IaI ≥ 0
4.
-x²-1 < 0 I*(-1)
x²+1 > 0
x ∈ R
Odp.D.R
5.
P(-1,5), R(1,3)
IPRI = √[(1+1)²+(3-5)²] = √8 = 2√2
IPRI = d
d = a√2
a√2 = 2√2
a = 2
obw. = 4a = 4·2 = 8
Odp.C.8
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1.
r = 2PΔ/(a+b+c)
2PΔ = r(a+b+c) /:2
PΔ = ½r(a+b+c)
PΔ = ½ah = ½r(a+b+c)
½r(5+12+13) = ½·5·12
15r = 30 /:15
r = 2 cm
Odp.D. 2 cm
2.
xw = -b/2a = -(-8/8) = 8/8 = 1
x-1 = 0
Odp.B. x-1 = 0
3.
Odp.A, bo IaI ≥ 0
4.
-x²-1 < 0 I*(-1)
x²+1 > 0
x ∈ R
Odp.D.R
5.
P(-1,5), R(1,3)
IPRI = √[(1+1)²+(3-5)²] = √8 = 2√2
IPRI = d
d = a√2
a√2 = 2√2
a = 2
obw. = 4a = 4·2 = 8
Odp.C.8