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a + b /2 * t
20+25 : 2 * 10
10+25 * 10
35 * 10
= 350 cm kuadrat..
kalo gasalah :)
L=1/2 .(45.10)
L=450/2
L=225 cm^2
miring=akar (2,5^2+10^2)=10,3 cm
keliling=10,3+20+10,3+25=65,6 cm