Matematika Sekolah Menengah Pertama tolong jawab plisssss​

tolong jawab plisssss​ Penjelasan dengan langkah-langkah: a. 2× + 5× + 2× = 90 9× = 90 x = 90/9 x = 10° b. <DAE = 2× = 2(10) = 20° <DAC = 5× = 5(10) = 50° <CAB = 2× = 2(10) = 20°