Question

Tolong ya nomor 24-25
(abc an nmr 25)
a. 132
b. 116
c. 88
d. 44

Answer 1

No 25.
--> Mencari tinggi trapesium                --> Mencari sisi miring trapesium :
L = a + b  x t                                          > 14 - 4 = 10,, 10 : 2 = 5
         2                                                    = 12² + 5² = 144 + 25 = √169 = 13 cm
108 = 4 + 14  x t
             2
108 = 9t
t     = 12

--> mencari keliling trapesium :             --> panjang kawat = 44 x 3 = 132 (A)
     14 + 13 + 4 + 13 = 44
No. 24 tidak tau

Answer 2

24. AB = 12
BD =akar (12^2 + 12^2) = akar (144+144)
=12 akar 2

BD = 3. DE
12 akar 2 = 3. DE
DE = 12akar 2 /3 = 4akar 2
BE = BD - DE = 12 akar 2 -4 akar 2 = 8 akar 2

EF /DA= BE /BD
EF/12 = 8 akar 2/12 akar 2
EF = 8

BF /BA =BE /BD
BF /12 =8 akar 2/12 akar 2
BF = 8

L arsir = L persegi - L trapesium
= 12.12 - 1/2.8.(8+12)
=144 - 80
=64

25.
108 = 1/2. (14+4).t
108 = 9t
t= 108/9 = 12

sisi miring = akar ( 12^2 + 5^2)
= akar (144+25)
= akar 169
=13
Keliling = 4 + 14 + 13+ 13 = 44
panjang kawat = 3. Keliling = 3.44 = 132