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a12=36
a=3
4/12 = a/9
12a=9 x 3
a = 36/12
a = 3
7. a. AD= akar 4^2 + 3^2
= akar 16 + 9
= akar 25
AD = 5
b. AD+BD / 5 = AC / AE
5 + BD / 5 = 6 / 4
4 ( 5+BD) = 6 x 5
20 + 4BD = 30
4BD = 30-20
BD = 10/4
BD = 2,5
c. AD/AB = EL/BC
5/ 7,5 = 3/ BC
5 BC = 3 X 7,5
BC = 22,5 / 5
BC= 4,5
d. kllg segitiga ABC = AC + AB+ BC
= 6 + 7,5+ 4,5
= 18,0 ATAU 18 :)
ket: ^ itu pangkat
maaf kalo salah :)