Объяснение:
1.
A = C = 60
B = D = 120
2.
CDE = COE = 86
3.
P = 12+ 14 + 18 =44 cm
AB =12cm BC = 14cm AC = 18cm
MK = 1/2AC
MK = 18/2 = 9 cm
4.
S = ab
a : b = 3 : 4
182 = 3x*4x
12 = 182
= 15,2
x = 3.9
a = 3 * 3.9 = 11.7
b = 4 * 3.9 = 15.6
5.
a = b = 10 cm
c = 12cm
h - ?
th Pivagor
=
= 100 + 36
h =
h = 11.6
S = 1/2*c*h
S = 6*11.6 = 69.6
6.
c = 90*
AB = 12
BC = 6
a = 60*
b = 90-60 = 30*
7.
BC = 13
AD = 37
BC = AB
h = 17.6
S = a+b/2*h
S = 13+37/2*17.6
S = 440 cm
Объяснение:
1.
A = C = 60
B = D = 120
2.
CDE = COE = 86
3.
P = 12+ 14 + 18 =44 cm
AB =12cm BC = 14cm AC = 18cm
MK = 1/2AC
MK = 18/2 = 9 cm
4.
S = ab
a : b = 3 : 4
182 = 3x*4x
12
= 182
x = 3.9
a = 3 * 3.9 = 11.7
b = 4 * 3.9 = 15.6
5.
a = b = 10 cm
c = 12cm
h - ?
th Pivagor
h =
h = 11.6
S = 1/2*c*h
S = 6*11.6 = 69.6
6.
c = 90*
AB = 12
BC = 6
a = 60*
b = 90-60 = 30*
7.
BC = 13
AD = 37
BC = AB
h =
h =
h =
h = 17.6
S = a+b/2*h
S = 13+37/2*17.6
S = 440 cm