[tex]a)\\\\mamy\ dwa\ prostokaty :\ \ P_{1}=a*b=2*5=10\ [j^2] \\\\prostokat:\ P_{2}=a*b=2*7=14\ [j^2] \\\\dwa\ trapezy :\ P_{3}=\frac{a+b}{2}*h=\frac{ 7+1}{2}*4=16 \ [j^2] \\\\prostokat:\ P_{4}=a*b=2*1=2\ [j^2]\\\\pole\ figury:\\\\P= 2P_{1}+P_{2}+ 2*P_{3} + P_{4}\\\\P= 2*10+14+2*16+2=20+14+32+2=68\ [j^2][/tex]
[tex]b)\\\\mamy\ prostokat :\ \ P_{1}=a*b=4*5=20\ [j^2] \\\\kwadrat:\ P_{2}=a^2=5^2=25\ [j^2]\\\\prostokat:\ P_{3}=a*b=3*5=15\ [j^2]\\\\dwa\ tojkaty\ prostokatne :\ P_{4}=\frac{1}{2}*ab=\frac{ 1}{2}*4*3=6 \ [j^2] \\\\pole\ figury:\\\\P= P_{1}+P_{2}+ P_{3} +2*P_{4}\\\\P= 20+25+15+2*6=60+12=72\ [j^2][/tex]
