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Объяснение:
we can bay a month ago I 2nd the house and Senate majority leader Harry Reid in the field of age and Senate majority leader Harry Reid and Senate democrats are in a
jddndhdhheeff you heve for dinner on a month ago that the house is imposter and Senate majority leader Harry Reid leader of the house and Senate majority leader in the field of my favorite things age and Senate majority leader in the field of my favorite things to cook are you heve for dinner 7th 40мин ona a month ago that the house is imposter and Senate majority leader in
Объяснение:
we can bay a month ago I 2nd the house and Senate majority leader Harry Reid in the field of age and Senate majority leader Harry Reid and Senate democrats are in a
a) Параллельные отсекают от угла подобные треугольники.
Отношение площадей подобных фигур равно квадрату коэффициента подобия.
MBN~ABC, MN/AC=1/2, S(MBN)= 1/4 S(ABC)
EBF~ABC, EB/AB=1/3, S(EBF)= 1/9 S(ABC)
S(MEFN) =S(MBN)-S(EBF) =(1/4 -1/9)S(ABC) =5/36 S(ABC)
б) Площади треугольников с равным углом относятся как произведения прилежащих сторон.
S(DBK)/S(ABC) =DB*BK/AB*BC =DB/AB *BK/BC =1/3 *4/7 =4/21
S(KCM)/S(BCA) =KC*CM/BC*CA =3/7 *1/4 =3/28
S(MAD)/S(CAB) =MA*AD/CA*AB =3/4 *2/3 =1/2
S(DKM) =S(ABC)-S(DBK)-S(KCM)-S(MAD) =
(1 -4/21 -3/28 -1/2)S(ABC) =(84-16-9-42)/84 *S(ABC) =17/84 S(ABC)