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a=3cm
b=11,6cm
h= 25% z 11,6cm= 11,6cm*0,25=2,9cm
Szukane:
P=?
P=1/2(a+b)*h
P=1/2(3cm+11,6cm)*2,9cm
P=1/2*14,6cm*2,9cm
P=21,17cm2
a i b to podstawy
h to wysokość
P = 1/2 (a+b)h = 1/2 (3+11,6)*2,9 = 1/2*14,6*2,9 = 21,17 cm²
Odp. Pole trapezu wynosi 21,17 cm².
:)
h = 11, 6 razy 0,25= 2,9
pole = a+b/2 razy h
pole rowna sie 21 , 17 cm