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penyiku sudut A = x
besar sudut A = 7/8x
sudut A + penyiku sudut A = 90
7/8x + x = 90
1 = 90
= 90
x = 90 :
x = 90 *
x = 48
Jawaban: B
19. ABD + DBC = 90 (sudut berpenyiku)
(5x + 3) + (3x + 7) = 90
8x + 10 = 90
- 10 - 10 +
8x = 80
=
x = 10
ABD = 5x + 3
ABD = 5(10) + 3
ABD = 50 + 3
ABD = 53
Jawaban: D
(5x+3) + (3x+7)=90
8x+10 =90
8x = 90-10
x = 80/8
x= 10
sudut ABD = (5x+3)
5(10)+3
50+3
=53