Ka bantuin jan ngasal ku report lngsung​

Jawab:

1. <ABD + <CBD = 180° (sudut berpelurus)

   7x + 5x = 180°

   12x = 180°

   x = 180° : 12 = 15°

  <ABD = 7x = 7(15) = 105°

2. <BAE = <DEF = 3y  (sudut sehadap)

   <DEF + <CEF = 180° (sudut berpelurus)

   <DEF = 180° – <CEF

   3y = 180° – 102°

   3y = 78°

   y = 78° : 3 = 26°

   Hubungan :

   <BAE dan <DEF = sudut sehadap

   <DEF dan <CEF = sudut berpelurus

3. <ABC = 180° – <CBD

              = 180° – 112°

              = 68°

   <BCA = 180° – (<BAC + <ABC)

              = 180° – (42° + 68°)

              = 180° – 110°

              = 70°