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35 = 10.(x+4)/2
35 = 5(x+4)
35= 5x+20
35-20=5x
15=5x
3=x
panjang diagonal 2 = x+4 cm
= 3+4 = 7 cm
d1 = 10
d2 = x+4
Luas = (d1xd2)/2
35 = 10 ( x + 4) / 2
35 = 5 ( x + 4)
35 = 5x + 20
35 - 20 = 5x
15 = 5x
x = 3
d2 = x+ 4 = 3 + 4 = 7 cm
2.
perpotongan diagonal belah keetupat adalah siku2
luas Δ ABD = 1/2 x a x t ----> segitiga sama kaki
= 1/2 xBD x AO
= 1/2 x10 x 12
= 60
luas ΔABD = 1/2 x alas x tinggi
= 1/2 x AB x DE
60 = 1/2 x 13 x DE
120 = 13 DE
DE = 9,2