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P = 20cm²
a = 16cm
P = ½ah
20cm² = ½ × 16cm × h
20cm² = 8cm × h
h = 20cm² ÷ 8 cm
h = 2,5cm
b)
P = 48cm²
a = 5cm
b = 7cm
P = (a + b) × h ÷ 2
48cm² = (5cm + 7cm) × h ÷ 2
48cm² = 12cm × h ÷ 2
48cm² = 6cm × h
h = 48cm² ÷ 6cm
h = 8cm
p = a*h/2
20 = 16*h/2
20 = 8h |:8
h= 2,5cm
2)
p= (a+b)*h/2
48 = (5+7)*h/2
48 = 12h/2
48 = 6h ||:6
h = 8cm