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x² = 2² + 4²
x² = 4+ 16
x² = 20
x= 2√5cm
Przeciwprostokątna wynosi 2√5 cm:)
2.
x² = 13² - 12²
x² = 25
x = √25
x = 5
Obw = 5 * 2 + 12 * 2 = 34cm
P= a*b = 5 * 12 = 60cm²
daj naj proszę:)
x²= 16 + 4
x² = 20 / √
x = √4*5
x = 2√5 cm
2. d = 13 cm
a = 12 cm
b²+ 12² = 13²
b²= 13²- 12²
b² = 169 - 144
b² = 25 /√
b = √25
b = 5
P = a * b
P = 12* 5
P = 60 (cm²_
Obw = a + a + b + b
Obw = 12 + 12 + 5 + 5
Obw = 34 cm
dasz naj?? ;)
a = 4 cm
b = 2 cm
c = ?
Korzystając z twierdzenia Pitagorasa.
a² + b² = c²
4² + 2² = c²
16 + 4 = c²
c² = 20 | √
c = √20 cm = 2√5 cm
Oblicz pole i obwód prostokąta, którego przekątna ma 13 cm a jeden z boków ma 12 cm.
d = 13 cm
a = 12 cm
b = ?
P = ?
O = ?
13 ² = 12² + b²
169 = 144 + b² | - 144
25 = b² | √
b = 5 cm
P = a * b = 12 cm * 5 cm = 60 cm ²
O = 2 * 12 cm + 2 * 5 cm = 24 cm + 10 cm = 34 cm