Penjelasan:
14.
Karena sama kaki, maka :
2(2m - 8) + (m + 4) = 88
4m - 16 + m + 4 = 88
5m - 12 = 88
5m = 100
m = 20
AC = (2m - 8)
AC = 2(20) - 8
AC = 32 cm
15.
PS = √(PR² - RS²)
PS = √(17² - 8²)
PS = √(289 - 64)
PS = √225
PS = 15 cm
L = 1/2 . PS . RS
L = 1/2 . 15 . 8
L = 120 cm²
16.
(x + 3) + 2x + (2x + 3) = 36
5x + 6 = 36
5x = 30
x = 6
AB = 2x = 2(6) = 12 cm
AC = (x + 3) = (6 + 3) = 9 cm
L = 1/2 . AB . AC
L = 1/2 . 12 . 9
L = 54 cm²
17.
L = 1/2at
t = 2L/a
t = 2(255)/15
t = 34 cm
Mapel : Matematika
Kelas : 8
Materi : Teorema Pythagoras/BD
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Penjelasan:
14.
Karena sama kaki, maka :
2(2m - 8) + (m + 4) = 88
4m - 16 + m + 4 = 88
5m - 12 = 88
5m = 100
m = 20
AC = (2m - 8)
AC = 2(20) - 8
AC = 32 cm
15.
PS = √(PR² - RS²)
PS = √(17² - 8²)
PS = √(289 - 64)
PS = √225
PS = 15 cm
L = 1/2 . PS . RS
L = 1/2 . 15 . 8
L = 120 cm²
16.
(x + 3) + 2x + (2x + 3) = 36
5x + 6 = 36
5x = 30
x = 6
AB = 2x = 2(6) = 12 cm
AC = (x + 3) = (6 + 3) = 9 cm
L = 1/2 . AB . AC
L = 1/2 . 12 . 9
L = 54 cm²
17.
L = 1/2at
t = 2L/a
t = 2(255)/15
t = 34 cm
Mapel : Matematika
Kelas : 8
Materi : Teorema Pythagoras/BD