Tolong bantu jawab yang nomor 18 sama 19 ya!!Mohon pake cara
abrakadabra
^2 = Pangkat 2 18) AC = √AB^2 + BC^2 AC = √12^2 + 9^2 AC = √144+81 AC = √225 AC = 15 ------------ AD = √CD^2 - AC^2 AD = √25^2 - 15^2 AD = √625 - 225 AD = √400 AD = 20 (C)
Depan sudut 45derajat = 3cm = De Miringnya segitiga = AC = mi 19) Sin 45 = de/mi √2/2 = 3/mi (kali silang) mi√2 = 3(2) mi√2 = 6 mi = 6/√2 (rasionalkan) mi = 6/√2 x √2/√2 mi = 6√2/2 mi = 3√2 AC = 3√2 -------------------------------------- AB = √AC^2 - BC^2 AB = √(3√2)^2 - 3^2 AB = √9(2) - 9 AB = √18-9 AB = √9 AB = 3
18)
AC = √AB^2 + BC^2
AC = √12^2 + 9^2
AC = √144+81
AC = √225
AC = 15
------------
AD = √CD^2 - AC^2
AD = √25^2 - 15^2
AD = √625 - 225
AD = √400
AD = 20 (C)
Depan sudut 45derajat = 3cm = De
Miringnya segitiga = AC = mi
19)
Sin 45 = de/mi
√2/2 = 3/mi
(kali silang)
mi√2 = 3(2)
mi√2 = 6
mi = 6/√2
(rasionalkan)
mi = 6/√2 x √2/√2
mi = 6√2/2
mi = 3√2
AC = 3√2
--------------------------------------
AB = √AC^2 - BC^2
AB = √(3√2)^2 - 3^2
AB = √9(2) - 9
AB = √18-9
AB = √9
AB = 3
AB dan AC
= 3cm dan 3√2cm (A)