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Zad.6)
Dane:
H = 15 cm
h = 12cm
b = 12 cm
c = 15 cm
Pc = ? [cm²]
Pc = 2Pp + Pb
Pp = 0,5( a + b)h
a = b + x
x² + h² = c²
x² = c² - h²
x² = (15 cm)² - (12 cm)²
x² = 225 cm² - 144 cm²
x² = 81 cm²
x = √(81 cm²)
x = 9 cm
a = 12 cm + 9 cm
a = 21 cm
Pp = 0,5(21 cm + 12 cm)*12 cm
Pp = (6 cm)*(33 cm)
Pp = 198 cm²
Pb = (15 cm) *(15 cm) + (12 cm)*(15 cm) + (12 cm)*(15 cm) + (21 cm)*(15 cm)
Pb = (15 cm)*( 15 cm + 12 cm + 12 cm + 21 cm)
Pb = (15 cm)*(60 cm)
Pb = 900 cm²
Pc = 2*(198 cm²) + 900 cm²
Pc = 396 cm² + 900 cm²
Pc = 1296 cm²
Odp: Pole powierzchni całkowitej graniastosłupa wynosi 1296 cm².
Zad. 7)
Dane:
D = 16 cm
α = 30
Pc = ? [cm²]
Pc = 2Pp + Pb
Pp = a²
Pb = 4a*H
H/D = sin30
H = D*sin 30
H = 16 cm *0,5
H = 8 cm
H² + d² = D² ( d - przekątna podstawy kwadratu d =a√2)
d² = D² - H²
d² = (16 cm)² - (8 cm)²
d² = 256 cm² - 64 cm²
d² = 192 cm²
d = √(192 cm²)
d = √(64*3) cm
d = 8√3 cm
d = a√2
a√2 = 8√3 cm /:√2
a = 4√6 cm
Pp = (4√6 cm)²
Pp = 96 cm²
Pb = (4√6 cm)*(8 cm)
Pb = 32√6 cm²
Pc = 2*96 cm² + 4*32√6 cm²
Pc = (192 + 128√6) cm²
Odp: Pole powierzchni całkowitej granastosłupa wynosi (192 + 128√6) cm².
Zad. 10)
Dane:
a = 4√3 cm
H = 4√3 cm
V = ? [cm³]
V = Pp*H
Pp = a²√3/4
Pp = (4√3 cm)²√3/4
Pp = 12√3 cm²
V = (12√3 cm²)*(4√3 cm)
V = 48*3 cm³
V = 144 cm³
Odp: C
Zad. 11)
Dane:
Pb = 2Pp
Pc = 64 cm²
V = ? [cm³]
Pc = 2Pp + Pb
Pc = 2Pp + 2Pp
4Pp = Pc /:4
Pp = Pc/4
Pp = 36cm²/4
Pp = 9 cm²
Pp = a²
a² = 9 cm²
a = 3 cm
ab = 2a² / :a
b = 2a
b = 6 cm
V = a²*b
V = (9 cm²)*(6 cm)
V =
Zad.12)
Dane:
D = 4√6 cm
α = 30
V = ? [cm³]
V = a²*H
H/D = sin30
H = D*sin30
H = (4√6 cm)*0,5
H = 2√6 cm
H² + d² = D²
d = a√2
d² = D² - H²
2a² = (4√6 cm)² - (2√6 cm)²
2a² = 96 cm² - 24 cm²
2a² = 72 cm² /:2
a² = 36 cm²
Pp = 36 cm²
V = (36 cm²)*(2√6 cm)
V = 72√6 cm³
Odp: D
zad.13)
Vp = (1cm2)*(15 cm)*(18 cm)
Vp = 3240 cm³
Vsz = (15 cm)³
Vsz = 3375 cm³
Vsz > V p
Odp: Większą objętość ma sześcian.
Zad. 14)
Dane:
a = 50 cm = 5 dm
b = 50 cm = 5 dm
V = 1 l = 1 dm³
h = ? [cm]
V = a*b*h
(5 dm)*(5 dm)* h = 1 dm³
25 dm²*h = 1 dm³ /:(25 dm²)
h = 0,04 dm
Odp:Wysokość akwarium wynosi 0,04 dm.