Uzupełnij tabelkę zawierającą dane o prostokątach :
tak wygląda ta tabelka :
a 8cm 1,5 dm 7cm _______ _______ 6 m
b 9cm 4dm ______ 15 cm 11cm _______
P=a*b _____ _____ 49 cm ( do kwadratu) 150 cm ( d.k.) _____ ____
Obw.=2*(a+b) ____ ____ ____ _____ 44 cm 30 m
Jakoś ta jest to kl. 5 zad 4 str 56 Matematyka wokół nas
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①
a = 8 cm
b = 9 cm
P = a * b = 8 cm * 9 cm = 72 cm²
Obw. = 2 * (a + b) = 2 * (8 cm + 9 cm) = 2 * 17 cm = 34 cm
②
a = 1,5 dm
b = 4 dm
P = a * b = 1,5 dm * 4 dm = 6 dm²
Obw. = 2 * (a + b) = 2 * (1,5 dm + 4 dm) = 2 * 5,5 dm = 11 dm
③
a = 7 cm
P = 49 cm²
P = a * b
7 cm * b = 49 cm² / : 7 cm
b = 7 cm
Obw. = 2 * (a + b) = 2 * (7 cm + 7cm) = 2 * 14 cm = 28 cm
④
b = 15 cm
P = 150 cm²
P = a * b
a * 15 cm = 150 cm² / : 15 cm
a = 10 cm
Obw. = 2 * (a + b) = 2 * (10 cm + 15 cm) = 2 * 25 cm = 50 cm
⑤
b = 11 cm
Obw. = 44 cm
Obw. = 2 * (a + b) = 2 * a + 2 * b
2 * a + 2 * 11 cm = 44 cm
2 * a + 22 cm = 44 cm
2 * a = 44 cm - 22 cm
2 * a = 22 cm / : 2
a = 11 cm
P = a * b = 11 cm * 11 cm = 121 cm²
⑥
a = 6 m
Obw. = 30 m
Obw. = 2 * (a + b) = 2 * a + 2 * b
2 * 6 m + 2 * b = 30 m
12 m + 2 * b = 30 m
2 * b = 30 m - 12 m
2 * b = 18 m / : 2
b = 9 m
P = a * b = 6 m * 9 m = 54 m²