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Dane:
P=20cm kw.
a=16cm
Szukane
h=?
Wzór: P=1/2 a*h
20=1/2* 16* h
20= 8h
h=20/8
h=2,5 cm
zad 2.
Dane:
P=48 cm kw
a=5cm
b=7cm
Szukane:
h=?
WZÓR: P=1/2 *h*(a+b)
48=1/2*h*(5+7)
48=1/2*h*12
48=6h
h=8cm
zad 3.
Dane:
P=26cm kw
a=3cm
h=4cm,
Szukane:
b=?
P=1/2*h*(a+b)
26=1/2 * 4 * (3+b)
26=2*(3+b)
26=6+2b
20=2b
b=10cm
Ptr- 20 cm2 h= ?
a= 16 cm
P= 1/2*a*h
20=1/2*16*h
20=8*h
h= 20/8
h= 2.5
2.Dane: Szukane:
p= 48 cm2 h=?
a=5
b=7
P=1/2(a+b)*h
48=1/2*(5+7)*h
48=6h
h= 48/6
h= 8
3.Dane: Szukane:
P= 26cm2 b=?
a= 3
h= 4
P=1/2(a+b)*h
26=1/2(3+b)*4
13=3+b
b= 13-3
b=10