Odpowiedź:
1. 1×1+2,5×2+1/2×1×2,5=1+5+1,25=7,25cm2
2. 2[1/2(3+1)1,5]=2[1/2×4×1,5]=2[2×1,5]=2×3=6cm2
3. 1/2×1×2+(2×2,5-1×1)+1×1=1+(5-1)+1=1+4+1=6cm2
4. 8(1/2×0,5×1,5)+1×1= 8×0.375+1=3+1=4cm2
5. 5×1+1/2×5×0,5=5+1,25=6,25cm2
6. 1×1+1/2(3+2)1+1/2×2×1,5=1+1/2×5×1+1,5=1+2,5+1,5=5cm2
7. 5(1/2×1×0,5)+3(1×0,5)+10×0,5=5×0,25+3×0,5+5=
=1,25+1,5+5=7,75cm2