1. Tentukan bayangan dari titik ( 3,-7) oleh rotasi dengan titik pusat (0,0) sejauh 180 derajat
a. (3,-7)
b. (3,7)
3. (-3,-7)
4. (-3,7 )![]()
a. (3,-7)
b. (3,7)
3. (-3,-7)
4. (-3,7 )
Jawab:
D. -3,7
Penjelasan dengan langkah-langkah:
[tex]\left[\begin{array}{ccc}x'\\y'\end{array}\right] = \left[\begin{array}{ccc}cos 180 &-sin 180\\sin 180&cos 180\end{array}\right]\left[\begin{array}{ccc}x\\y\end{array}\right][/tex]
[tex]\left[\begin{array}{ccc}x'\\y'\end{array}\right] = \left[\begin{array}{ccc}-1 &0\\0&-1\end{array}\right]\left[\begin{array}{ccc}x\\y\end{array}\right][/tex]
[tex]\left[\begin{array}{ccc}x'\\y'\end{array}\right] = \left[\begin{array}{ccc}-x\\-y\end{array}\right] =\left[\begin{array}{ccc}-3\\-(-7)\end{array}\right] =\left[\begin{array}{ccc}-3\\7\end{array}\right][/tex]
[answer.2.content]
