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h = 12cm
Obw = 36cm
b = 36cm - 2* 13 cm
b = 10cm
P = 1/2b * h
P = 1/2 * 10 * 12
P = 60cm²
Pzdr ;)
h = 12cm
Obwód = 36cm
a = 36cm - 2* 13 cm
a = 10cm
P= a×h÷2
P=10×12÷2=60 cm²
h = 12cm
Obw = 36cm
b = 36cm - 2* 13 cm
b = 10cm
P = 1/2b * h
P = 1/2 * 10 * 12
P = 60cm²