Odpowiedź:
z.1
P = 8 cm* 8 cm* sin 45° = 64 *0,5√2 cm² = 32√2 cm²
z.2
b = 18 cm
a = 24 cm = ( x + 18 + x ) cm ⇒ x = 3 cm
Tw. Pitagorasa
3² + h² = 13²
h² = 169 - 9 = 160 = 16*10
h = 4√10 [cm ]
p² = ( 3 + 18)² + h² = 21² + 160 = 441 + 160 = 601
p= [tex]\sqrt{601}[/tex] cm
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Pole trapezu
P = 0,5*(a + b)*h = 0,5*( 24 + 18) cm*4√10 cm = 84√10 cm²
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Szczegółowe wyjaśnienie: