Proszę o pomoc!!! NA JUTRO! .... Question from @dariamazorska

dariamazorska @dariamazorska

June 2022 1 8 Report

Proszę o pomoc!!! NA JUTRO!

knyga2502

Odpowiedź:

Szczegółowe wyjaśnienie:

Zad. 2

a) $P=\frac{1}{2} (a+b)h$

$a = 3 cm\\b = 5 cm\\h = 11 cm\\P=\frac{1}{2} (3 cm + 5 cm)*11 cm=\frac{1}{2} *8 cm * 11 cm=4 cm * 11 cm=44 cm^{2}$

$a=3,5 cm\\b=4,8 cm\\h=6 cm\\P=\frac{1}{2} (3,5 cm+4,8 cm)*6 cm=8,3 cm*3 cm=24,9cm^{2}$

$a=4 cm\\b=10 cm\\h=3,2 cm\\P=\frac{1}{2} (4 cm+10 cm)*3,2cm=\frac{1}{2} *14 cm*3,2 cm=7 cm*3,2 cm=22,4 cm^{2}$

$a=12 cm\\b=55 cm\\h=40 cm\\P=\frac{1}{2} (12 cm+55 cm)*40 cm=67 cm*20 cm=1340 cm^{2}$

Zad. 3

$P=\frac{1}{2} (a+b)h\\a=25 cm\\b=41 cm\\h=15 cm\\P=\frac{1}{2} (25 cm+41 cm)*15 cm=\frac{1}{2} *66 cm*15 cm=33 cm*15 cm=495 cm^{2} \\\\Ob= a+b+c+d\\\\c=25 cm\\d=39 cm\\Ob=25 cm+41 cm+25 cm+39cm=130 cm$

$a=4 cm\\b=60 cm\\P=\frac{1}{2}(4 cm+60 cm)*15cm=\frac{1}{2}*64 cm*15 cm=32 cm*15 cm=480 cm^{2} \\\\c=25 cm\\d=39 cm\\Ob=4 cm+60 cm+25 cm+39 cm=128 cm$

$a=7 cm\\b=15 cm\\h=6 cm = c\\P=\frac{1}{2} (7 cm+15cm)*6 cm=22cm*3cm=66cm^{2} \\\\d=10cm\\Ob=7cm+15cm+6cm+10cm=38cm$

$a=36cm\\b=8cm\\h=7,5cm\\P=\frac{1}{2} (36cm+8cm)*7,5cm=\frac{1}{2} *44cm*7,5cm22cm*7,5cm=165cm^{2} \\\\c=19,5cm\\d=12,5cm\\Ob=36cm+8cm+19,5cm+12,5cm=76m$

Zad. 4

$a=7cm\\b=a+2cm=7cm+2cm=9cm\\h=8\\\\P=\frac{1}{2}(a+b)h\\ \\P=\frac{1}{2}(7cm+9cm)*8cm=16cm*4cm=64cm^{2}$

Zad. 5

$h=8cm\\a=\frac{1}{4} h=\frac{1}{4} *8cm=2cm\\b=h+7cm=8cm +7 cm=15cm\\\\P=\frac{1}{2} (a+b)h\\\\P=\frac{1}{2}(2cm+15cm)*8cm=17cm*4cm=68cm^{2}$

Zad. 6

$a=4m\\b=7m\\h=4m\\\\P=\frac{1}{2}(a+b)h\\ \\P=\frac{1}{2}(4m+7m)*4m=11m*2m=22m^{2}$

Zad. 7

$P=30cm^{2} \\a=7cm\\b=8cm\\\\P=\frac{1}{2}(a+b)h\\ \\30cm^{2} =\frac{1}{2}(7cm+8cm)*h /*2\\ 60cm^{2} =(7cm+8cm)*h\\60cm^{2}=15cm*h/:15cm\\h=\frac{60cm^{2} }{15cm} \\h=4cm$